Waki’ reported: Qays, may Allah have mercy on him, said, “It is said that whoever has the quality of gentleness, it will benefit him in the Hereafter.”
Source: Muṣannaf Ibn Abī Shaybah 25309
عَنْ وَكِيعٌ عَنْ قَيْسٍ رحمه الله قَالَ كَانَ يُقَالُ مَنْ يُؤْتَ الرِّفْقَ فِي الدُّنْيَا يَنْفَعْهُ فِي الْآخِرَةِ
25309 مصنف ابن أبي شيبة