Musnad Abu Ya'la al-Mawsili 160:7

Sarij ibn Yunus narrated to us, Ibrahim ibn Khaytham ibn 'Arak ibn Malik narrated to us, from his father, from his grandfather, from Abu Hurayrah, from the Prophet (peace be upon him), who said: "Be gentle regarding Allah, be gentle. Were it not for bowing youths, kneeling elders, suckling infants, and grazing livestock, the punishment would have been poured down upon you in torrents."