When the Messenger of Allah ﷺ married Umm Salama, he stayed with her for three nights and said, "You are not insignificant to your husband. If you wish, I will stay with you for seven nights, but if I stay with you for seven, I will stay with my other wives for seven as well."
حدثنا أبو بكر بن أبي شيبة ومحمد بن حاتم ويعقوب بن إبراهيم واللفظ لأبي بكر قالوا حدثنا يحيى بن سعيد عن سفيان عن محمد بن أبي بكر عن عبد الملك بن أبي بكر بن عبد الرحمن بن الحارث بن هشام عن أبيه
أن رسول الله ﷺ لما تزوج أم سلمة أقام عندها ثلاثا وقال إنه ليس بك على أهلك هوان إن شئت سبعت لك وإن سبعت لك سبعت لنسائي
Muslim narrated the hadith of Thawri, from Muhammad bin Abu Bakr, from Abdul-Malik bin Abu Bakr, from his father, from Umm Salama, with a connected chain, "If you wish, I will make it seven for you."He also narrated the hadith of Hafs bin Ghiyath, from Abdul-Wahid bin Ayman, from Abu Bakr, from Umm Salama, with a connected chain.Abdullah bin Abu Bakr and Abdul-Rahman bin Humayd, however, narrated it from Abdul-Malik bin Abu Bakr, from Abu Bakr, stopping there without carrying the chain back to Umm Salama.Sulayman bin Bilal and Abu Damra said the same, from Abdul-Rahman bin Humayd.