Hadith.4464 - Al-Hasan ibn Mahbub narrated from Abu Ayyub, from Abu Ubaydah, from Abu Ja'far Imam Muhammad ibn Ali Al-Baqir (as):
He was asked about a man who married a free woman and two bondwomen in a single contract.
Imam (as) said
"As for the free woman, her marriage is valid, and if he specified a dowry for her, it belongs to her. However, as for the two bondwomen, their marriage in the same contract with the free woman is invalid. He must separate from them."