The Book of Marriage
Ṣaḥīḥ Muslim 3564
لَقَدْ هَمَمْتُ أَنْ أَنْهَى عَنِ الْغِيلَةِ حَتَّى ذَكَرْتُ أَنَّ الرُّومَ وَفَارِسَ يَصْنَعُونَ ذَلِكَ فَلاَ يَضُرُّ أَوْلاَدَهُمْ
laqad hamamtu an anhā ʿani al-ghīlah ḥattā dhakartu anna ar-rūma wafārisa yaṣnaʿūna dhalika falā yaḍurru awlādahum
Transliteration generated from the Arabic vowel marks
The full narration
Judaima daughter of Wahb al-Asadiyya (Allah be pleased with her) reported that she heard Allah's Messenger (ﷺ) assaying:I intended to prohibit cohabitation with a suckling woman until I considered that the Romans and the Persians do it without any injury being caused to their children thereby. (Imam Muslim said: Khalaf reported it from Judamat al-'Asadiyya, but the correct wording is what has been stated by Yahya)
Source
Ṣaḥīḥ Muslim · 3564