Musannaf Ibn Abi Shaybah 18094 — A man who marries a woman on her own

Al-Sha'bi (may Allah have mercy on him) said: If a marriage takes place on the condition that the dowry will be set by the judgment of the woman or the man, and then the one setting it is unjust in the dowry, she will receive the dowry customary for women like her (mahr al-mithl), without any reduction or excess, and the marriage is valid.