Musannaf Ibn Abi Shayba 3:3526

Waki’ narrated to us, from Sufyan, from ‘Imran ibn Zabyan, from Abu Yahya Hakim ibn Sa’d, from Salman, who said: "If one of you breaks his ablution during prayer, let him depart without calling attention to his action. Let him perform ablution, then let him return to the verse he was reciting."