Muwatta Malik, Book 20, Hadith 2 (USC-MSA) ⓘ
Yahya related to me from Malik from Yahya ibn Said from Said ibn al-Musayyab that Asma bint Umays gave birth to Muhammad ibn Abi Bakr at Dhu'l-Hulayfa and Abu Bakr told her to do ghusl and then enter ihram.
وَحَدَّثَنِي عَنْ مَالِكٍ، عَنْ يَحْيَى بْنِ سَعِيدٍ، عَنْ سَعِيدِ بْنِ الْمُسَيَّبِ، أَنَّ أَسْمَاءَ بِنْتَ عُمَيْسٍ، وَلَدَتْ، مُحَمَّدَ بْنَ أَبِي بَكْرٍ بِذِي الْحُلَيْفَةِ فَأَمَرَهَا أَبُو بَكْرٍ أَنْ تَغْتَسِلَ، ثُمَّ تُهِلَّ .
also referenced under: Book 20, Hadith 709 (In-Book)