Musannaf Ibn Abi Shayba 9:1651

Abu Bakr narrated to us, he said: Abbad bin al-Awwam narrated to us, from Umar bin Amir, who said: I asked al-Sha'bi and said: A man said to a man, "When Shawwal passes, I will marry my daughter to you." He said: This is not a marriage.