It is narrated from Sayyiduna al-Miswar bin Makhramah (may Allah be pleased with him) that the Messenger of Allah (peace and blessings be upon him) commanded Subay'ah (may Allah be pleased with her) to marry as soon as she had recovered from her postnatal bleeding (nifas).
The narrator said: Ibn Ashkib said it this way: Asim bin Umar.
Hadith Referenceالمعجم الكبير للطبراني / باب الميم / 17146