Muhammad bin Sirin (may Allah have mercy on him) says that Sayyiduna Ubayy bin Ka'b (may Allah be pleased with him) gave Sayyiduna Umar (may Allah be pleased with him) some of the fruit of his land as a gift, and he returned it. Sayyiduna Ubayy bin Ka'b (may Allah be pleased with him) said: Why did you return my gift? You know that my fruit is among the finest of the people of Madinah; accept my gift. For Sayyiduna Umar (may Allah be pleased with him) had lent him ten thousand dirhams.
This chain is munqati' (broken).
Hadith Referenceالسنن الكبرى للبيهقي / كتاب البيوع / 10929