Sahih Muslim 1654
Sahih Muslim · Book 27: The Book of Oaths · Saying: "If Allah wills" when swearing oaths and at other times
This hadith has been narrated on the authority of Abu Zinad with the same chain of transmitters with a variation of (these words):
وَحَدَّثَنِيهِ سُوَيْدُ بْنُ سَعِيدٍ ، حَدَّثَنَا حَفْصُ بْنُ مَيْسَرَةَ ، عَنْ مُوسَى بْنِ عُقْبَةَ ، عَنْ أَبِي، الزِّنَادِ بِهَذَا الإِسْنَادِ مِثْلَهُ . غَيْرَ أَنَّهُ قَالَ " كُلُّهَا تَحْمِلُ غُلاَمًا يُجَاهِدُ فِي سَبِيلِ اللَّهِ ".
" Every one of them giving birth to a child, who would have fought in the cause of Allah."