Musannaf Ibn Abi Shayba 3:2200

Qabisa narrated to us, he said: Sufyan narrated to us, from al-Shaybani, from Bakr ibn al-Akhnas, from Sa’id ibn Jubayr, who said: "If he prays with them while he is without ablution, he repeats [the prayer], but they do not repeat." Sufyan said: "And it is more beloved to me that he repeats and they repeat."