Praise be to Allah,
Hushaym narrated to us from Humayd from Anas ibn Maalik who said,
“When Allah’s Messenger (peace and blessings be on him) married Safiyyah [bint Huyayy], he stayed with her for three nights, and she had been previously married.”
(Musnad Ahmad, Vol. 3, p. 98. The isnaad of this Hadeeth is Saheeh according to the conditions set by al-Bukhaaree and Muslim.)
Commentary
Al-Bukhaaree has reported on the authority of Anas ibn Maalik who said, “The tradition of the is that if someone marries a virgin and he already has a wife who was previously married, then he should stay with the
virgin for seven days; and if someone marries a woman who was previously married and he already has a virgin wife with him, then he should stay with her for three days .”
Source:
Thulaathiyyaat Musnad Ahmad ibn Hanbal (may Allah have mercy on him)
Reports of Imaam Ahmad that have only three narrators between him and the Prophet, peace, and blessings be upon him.
Shaykh Muhammad ibn Ahmad ibn Saalim as–Saffaareenee al–Hanbalee ~(1114 –1188 AH)