Musannaf Ibn Abi Shayba 11:15

Hushaym ibn Bashir narrated to us, [saying]: Mujalid ibn Sa’id informed us, from Abu al-Wadak, from Abu Sa’id, who attributed the hadith [to the Prophet], he said: "Three [types of people] Allah laughs at: A man when he stands at night to pray, a group when they stand in rows for prayer, and a group when they stand in rows to fight the enemy."