Musnad Ahmad Hadith 21110

It is narrated from Ibn Abbas (may Allah be pleased with them both) that a man came to Umar Farooq (may Allah be pleased with him) and said, "Famine has consumed us." Umar (may Allah be pleased with him) asked him, "Which tribe do you belong to?" Umar (may Allah be pleased with him) kept inquiring about his lineage until he recognized him and found out that he was actually well-off financially. Umar (may Allah be pleased with him) said, "Even if a person has one or two valleys full of wealth, he will still seek a third." Upon this, Ibn Abbas (may Allah be pleased with them both) added, "The belly of the son of Adam is only filled with dust, then Allah turns with mercy to the one who repents." Umar (may Allah be pleased with him) asked him, "From whom did you hear this?" He replied, "From Ubayy bin Ka'b (may Allah be pleased with him)." Umar (may Allah be pleased with him) said, "Come to me tomorrow." When Ibn Abbas (may Allah be pleased with them both) reached his mother, Umm al-Fadl (may Allah be pleased with her), he mentioned this incident to her. She said, "What was the need for you to speak in front of Umar (may Allah be pleased with him)?" Now Ibn Abbas (may Allah be pleased with them both) became apprehensive that perhaps Ubayy (may Allah be pleased with him) might have forgotten it, but his mother reassured him, saying, "I hope he has not forgotten it." So, the next day, when Ibn Abbas (may Allah be pleased with them both) reached Umar (may Allah be pleased with him), there was a whip lying near him. We both set out towards Ubayy bin Ka'b (may Allah be pleased with him). Ubayy (may Allah be pleased with him) came out, having performed fresh ablution. He said, "I was afflicted with 'madhi' (pre-seminal fluid), so I only washed my private part (and performed ablution)." Umar (may Allah be pleased with him) asked, "Is this permissible?" He replied, "Yes." Umar (may Allah be pleased with him) asked, "Did you hear this from the Prophet Muhammad (ﷺ)?" He replied, "Yes." Then Umar (may Allah be pleased with him) asked about the statement of Ibn Abbas (may Allah be pleased with them both), and he also confirmed it.