Beginning of Creation
حَدَّثَنَا حَجَّاجُ بْنُ مِنْهَالٍ، حَدَّثَنَا شُعْبَةُ، قَالَ عَدِيُّ بْنُ ثَابِتٍ أَخْبَرَنِي قَالَ سَمِعْتُ الْبَرَاءَ ـ رضى الله عنه ـ عَنِ النَّبِيِّ صلى الله عليه وسلم قَالَ لَمَّا مَاتَ إِبْرَاهِيمُ قَالَ " إِنَّ لَهُ مُرْضِعًا فِي الْجَنَّةِ ".Narrated Al-Bara (bin Azib):The Prophet, after the death of his son Ibrahim, said, "There is a wet-nurse for him (i.e. Ibrahim) in Paradise
From Sahih al-Bukhari, whose reports the scholars accept as authentic.