God's Prophet (a.s) said: “Kindness is good, and sternness is despised.”
قال النبي (صلى الله عليه وآله): الرفق يمن والخرق شؤم.
Similar narrations
Al-Kāfi #401“The Messenger of Allah has said, ‘Friendliness is a blessing and detachment is evil.’”
Kitāb al-Zuhd #74“I went to meet Abū ʿAbdillāh (a) while there was a man with him, and [I heard that] Abū ʿAbdullāh (a) told him, ‘The Messenger of Allah (ṣ)...