Musannaf Ibn Abi Shayba 3:4276

Abu Bakr narrated to us, he said: Waki’ narrated to us, he said: Sufyan narrated to us, from Jabir, from Sa’id ibn Ubaydah, from Salt ibn Zufar, he said: I performed all the prayers with Hudhayfah, and he added a rak’ah to the Maghrib prayer for me.