Mishkat al-Masabih, hadith 3061

وَعَن جذامة بِنْتِ وَهْبٍ قَالَتْ: حَضَرْتُ رَسُولَ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ فِي أُنَاسٍ وَهُوَ يَقُولُ: «لقد هَمَمْت أَن أَنْهَى عَنِ الْغِيلَةِ فَنَظَرْتُ فِي الرُّومِ وَفَارِسَ فَإِذَا هُمْ يُغِيلُونَ أَوْلَادَهُمْ فَلَا يَضُرُّ أَوْلَادَهُمْ ذَلِكَ شَيْئًا» . ثُمَّ سَأَلُوهُ عَنِ الْعَزْلِ فَقَالَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ: " ذَلِكَ الوأد الْخَفي وَهِي (وَإِذا الموؤودة سُئِلت) رَوَاهُ مُسلم

I was with God’s Messenger along with some people when he was saying, “I intended to prohibit suckling during pregnancy* but I considered the Greeks and the Persians and saw that they suckled their children during pregnancy without any injury being caused to their children thereby.” Then they asked him about withdrawing the penis and God’s Messenger replied, “That is the secret burying alive” and reference is made to it in the words, “When the girl buried alive will be asked (Al-Qur’an 81:8).” *(Ghila. It means either suckling during pregnancy, or intercourse with a woman while she is suckling a child. Muslim transmitted it.