Sayyiduna Abdullah bin Mas'ud (may Allah be pleased with him) narrates: The Prophet (peace and blessings be upon him) said: "Gentleness is blessing, and harshness is ill omen."
Al-Tabarani recorded it in al-Mu'jam al-Awsat; its chain contains al-Mu'alla bin Irfan, who is matruk (abandoned).
Hadith Referenceمجمع الزوائد ومنبع الفوائد / كتاب الأدب / 12653