Let us see an authentic narration which shows that the verse of muta’a was revealed after battle of oatas
please keep in mind that battle of hunain happened after victory of Mecca [al Bidaya wa Nihaya, urdu version, vol 4, page 256]
And this battle, of Oatas, it happened after Hunain [al Bidaya, urdu version, vol 4, page 264]

Let us see a reference for this now

We find in Musnad Ahmad



Abu saeed says that we got women as war booty in battle of Oatas as prisoners. They were married and We did not like this thing that We have physical relations with them in life time of their husbands. So we asked Holy Prophet (asws) about this. And upon this revealed the verse: And all married women except those whom your right hands possess: so We took their private organs as halal/allowed

[Musnad Ahmad, urdu version, vol 5, page 219]

Molvi zafar says that it is Sahih as per Muslim

Sheikh Shoaib says Hadeeth is Sahih though this chain is broken [18/224/11691]

Sheikh hamza says Sahih Sanad [10/228]

Also there in urdu version, 5/255. Molvi zafar says Sahih as per Muslim

The narration mentions half of this verse, it is the full verse 24 of Surat un Nisa

۞ وَالْمُحْصَنَاتُ مِنَ النِّسَاءِ إِلَّا مَا مَلَكَتْ أَيْمَانُكُمْ ۖ كِتَابَ اللَّهِ عَلَيْكُمْ ۚ وَأُحِلَّ لَكُمْ مَا وَرَاءَ ذَٰلِكُمْ أَنْ تَبْتَغُوا بِأَمْوَالِكُمْ مُحْصِنِينَ غَيْرَ مُسَافِحِينَ ۚ فَمَا اسْتَمْتَعْتُمْ بِهِ مِنْهُنَّ فَآتُوهُنَّ أُجُورَهُنَّ فَرِيضَةً ۚ وَلَا جُنَاحَ عَلَيْكُمْ فِيمَا تَرَاضَيْتُمْ بِهِ مِنْ بَعْدِ الْفَرِيضَةِ ۚ إِنَّ اللَّهَ كَانَ عَلِيمًا حَكِيمًا

regarding this verse being for muta’a, please see this link

http://www.h-alajmi.com/book.php?bid=82

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