Muslim Bani Israel will support Prophet Isa (alayhay Salam) in end times

Mainly the Banu Isaac (اسحاق‎ or Banu Israel) will fight the Armageddon with the Romans (The West).

Armageddon → Victorious One-Third → Conquest of Constantinople → Army with ʿĪsā عليه السلام

1) Armageddon (al-Malḥamah al-Kubrā) and the Split into Three Thirds

Arabic (full relevant text)

عَنْ أَبِي هُرَيْرَةَ، أَنَّ رَسُولَ اللَّهِ ﷺ قَالَ:
«لَا تَقُومُ السَّاعَةُ حَتَّى يَنْزِلَ الرُّومُ بِالأَعْمَاقِ أَوْ بِدَابِقَ، فَيَخْرُجُ إِلَيْهِمْ جَيْشٌ مِنَ الْمَدِينَةِ مِنْ خِيَارِ أَهْلِ الْأَرْضِ يَوْمَئِذٍ، فَإِذَا تَصَافُّوا قَالَتِ الرُّومُ: خَلُّوا بَيْنَنَا وَبَيْنَ الَّذِينَ سَبَوْا مِنَّا نُقَاتِلْهُمْ، فَيَقُولُ الْمُسْلِمُونَ: لَا وَاللَّهِ لَا نُخَلِّي بَيْنَكُمْ وَبَيْنَ إِخْوَانِنَا، فَيُقَاتِلُونَهُمْ، فَيَنْهَزِمُ ثُلُثٌ لَا يَتُوبُ اللَّهُ عَلَيْهِمْ أَبَدًا، وَيُقْتَلُ ثُلُثُهُمْ أَفْضَلُ الشُّهَدَاءِ عِنْدَ اللَّهِ، وَيَفْتَتِحُ الثُّلُثُ لَا يُفْتَنُونَ أَبَدًا، فَيَفْتَتِحُونَ قُسْطَنْطِينِيَّةَ، فَبَيْنَمَا هُمْ يَقْتَسِمُونَ الْغَنَائِمَ قَدْ عَلَّقُوا سُيُوفَهُمْ بِالزَّيْتُونِ، إِذْ صَاحَ فِيهِمُ الشَّيْطَانُ: إِنَّ الْمَسِيحَ قَدْ خَلَفَكُمْ فِي أَهْلِيكُمْ، فَيَخْرُجُونَ، وَذَلِكَ بَاطِلٌ، فَإِذَا جَاءُوا الشَّامَ خَرَجَ، فَبَيْنَمَا هُمْ يُعِدُّونَ لِلْقِتَالِ، يُسَوُّونَ الصُّفُوفَ، إِذْ أُقِيمَتِ الصَّلَاةُ، فَيَنْزِلُ عِيسَى ابْنُ مَرْيَمَ ﷺ فَيُؤُمُّهُمْ، فَإِذَا رَآهُ عَدُوُّ اللَّهِ ذَابَ كَمَا يَذُوبُ الْمِلْحُ فِي الْمَاءِ، فَلَوْ تَرَكَهُ لَذَابَ حَتَّى يَهْلِكَ، وَلَكِنْ يَقْتُلُهُ اللَّهُ بِيَدِهِ، فَيُرِيهِمْ دَمَهُ فِي حَرْبَتِهِ».

المصدر: صحيح مسلم، كتاب الفتن وأشراط الساعة، حديث رقم 2897.

English (full relevant translation)

Abū Hurayrah (RA) reported that the Messenger of Allah ﷺ said:
“The Hour will not arrive until the Romans camp at al-Aʿmāq or Dābiq. Then an army will come out from Madinah, consisting of the best people on earth at that time. When they line up for battle, the Romans will say: ‘Leave us with those who were taken captive from among us so we may fight them.’ The Muslims will reply: ‘No, by Allah, we will never hand over our brothers to you.’ Then they will fight, and:

• One-third (33.33%) will flee, and Allah will never forgive them;
• One-third (33.33%) will be killed, and they will be the best martyrs with Allah;
• One-third (33.33%) will be victorious and will never be tested again.

They will then conquer Constantinople. While they are dividing the spoils and have hung their swords on the olive trees, Satan will cry out: ‘The Messiah (Dajjāl) has taken your families in your absence!’ They will set out, but it will be false. When they reach ash-Shām, he (the Dajjāl) will indeed appear. As they are preparing for battle and arranging their ranks, the prayer will be established, and ʿĪsā ibn Maryam (Jesus, peace be upon him) will descend and lead them in prayer. When the enemy of Allah (the Dajjāl) sees him, he will melt like salt in water. If he were left, he would melt until he perished; but Allah will kill him by the hand of ʿĪsā, who will then show them his blood on his spear.”
Reference: Ṣaḥīḥ Muslim, 2897.

What this shows:

• The army splits into three equal parts.
• The remaining victorious third (33.33%) explicitly go on to conquer Constantinople, then move toward ash-Shām where ʿĪsā عليه السلام descends and joins them.
• Practically, this victorious third becomes (almost) 100% of the army present with ʿĪsā عليه السلام at that moment.

2) Identifying the Victorious 33.33%: They are Banu Isḥāq (Banu Israel Muslims)

Arabic

عَنْ أَبِي هُرَيْرَةَ، أَنَّ النَّبِيَّ ﷺ قَالَ:
«سَمِعْتُمْ بِمَدِينَةٍ جَانِبٌ مِنْهَا فِي الْبَرِّ وَجَانِبٌ مِنْهَا فِي الْبَحْرِ؟ قَالُوا: نَعَمْ يَا رَسُولَ اللَّهِ. قَالَ: لَا تَقُومُ السَّاعَةُ حَتَّى يَغْزُوَهَا سَبْعُونَ أَلْفًا مِنْ بَنِي إِسْحَاقَ، فَإِذَا جَاءُوهَا نَزَلُوا فَلَمْ يُقَاتِلُوا بِسِلَاحٍ وَلَمْ يَرْمُوا بِسَهْمٍ، قَالُوا: لَا إِلَهَ إِلَّا اللَّهُ وَاللَّهُ أَكْبَرُ، فَيَسْقُطُ أَحَدُ جَانِبَيْهَا، قَالَ ثَوْرٌ: لَا أَعْلَمُ إِلَّا قَالَ الَّذِي بِالْبَحْرِ، ثُمَّ يَقُولُونَ الثَّانِيَةَ: لَا إِلَهَ إِلَّا اللَّهُ وَاللَّهُ أَكْبَرُ فَيَسْقُطُ جَانِبُهَا الآخَرُ، ثُمَّ يَقُولُونَ الثَّالِثَةَ: لَا إِلَهَ إِلَّا اللَّهُ وَاللَّهُ أَكْبَرُ فَيُفْتَحُ لَهُمْ، فَيَدْخُلُونَهَا فَيَغْنَمُونَ، فَبَيْنَمَا هُمْ يَقْتَسِمُونَ الْمَغَانِمَ إِذْ جَاءَهُمُ الصَّرِيخُ: إِنَّ الدَّجَّالَ قَدْ خَرَجَ، فَيَتْرُكُونَ كُلَّ شَيْءٍ وَيَرْجِعُونَ».

المصدر: صحيح مسلم، كتاب الفتن وأشراط الساعة.

English

The Prophet ﷺ said:
“You have heard of a city, one side of which is on land and the other in the sea (Constantinople)?” They said: “Yes, O Messenger of Allah.” He said: “The Hour will not come until seventy thousand from Banu Isḥāq attack it. When they reach it, they will camp; they will not fight with weapons nor shoot arrows. They will say: Lā ilāha illallāh, Allāhu Akbar, and one side of the city will collapse (Thawr said: I think he said the side by the sea). Then they will say it a second time and the other side will collapse. Then they will say it a third time and it will be opened for them. They will enter it and take the spoils. While they are dividing the spoils, a crier will come to them: ‘Verily, the Dajjāl has emerged,’ so they will leave everything and return.”
Reference: Ṣaḥīḥ Muslim, Kitāb al-Fitan.

What this shows (joined with previous Hadith 1):

• The victorious third (33.33%) that conquers Constantinople (Hadith 1) are identified here as Banu Isḥāq (Muslims of Israelite descent).
• Therefore, those who stand with ʿĪsā عليه السلام upon his descent are (almost) entirely this victorious third, i.e., overwhelmingly Banu Isḥāq.

3) Corroboration: Arabs will be very few at that time

Arabic

عَنْ أُمِّ شَرِيكٍ قَالَتْ: قُلْتُ: يَا رَسُولَ اللَّهِ! فَأَيْنَ الْعَرَبُ يَوْمَئِذٍ؟ قَالَ: «هُمْ قَلِيلٌ، وَجُلُّهُمْ بِبَيْتِ الْمَقْدِسِ، وَإِمَامُهُمْ رَجُلٌ صَالِحٌ… فَبَيْنَمَا إِمَامُهُمْ قَدْ تَقَدَّمَ يُصَلِّي بِهِمُ الصُّبْحَ، إِذْ نَزَلَ عَلَيْهِمْ عِيسَى ابْنُ مَرْيَمَ ﷺ…»

المصدر: سنن ابن ماجه، كتاب الفتن، حديث 4077.

English

Umm Sharik (RA) asked: “O Messenger of Allah, where will the Arabs be on that day?” He said:
“They will be few, and most of them will be in Bayt al-Maqdis, and their leader will be a righteous man… While their Imam has stepped forward to lead them in the morning prayer, ʿĪsā ibn Maryam (peace be upon him) will descend…”
Reference: Sunan Ibn Mājah, Kitāb al-Fitan, 4077.

What this supports:

• When ʿĪsā عليه السلام descends, the Arabs are few; thus, the army present is dominated by the earlier victorious third or the 33.33%—the same group that conquered Constantinople—i.e., Banu Isḥāq.

Final Synthesis (Plain & Direct)

• Armageddon splits the Muslim army into three equal parts:
  • 33.33% flee (never forgiven),
  • 33.33% are martyred (best martyrs),
  • 33.33% are victorious and “never tested again.”
• That victorious 33.33% immediately conquer Constantinople (Hadith 1).
• The Conquerors of Constantinople are specified as Banu Isḥāq (Hadith 2).
• They then move to ash-Shām, form the ranks for Ṣalāh, and ʿĪsā عليه السلام descends to them (Hadith 1).
• Since the Arabs are few at that time (Hadith 3), the army with ʿĪsā عليه السلام is (almost) entirely the same victorious third, i.e., Banu Isḥāq / Banu Israel Muslims.