It is narrated from Qabisah bin Dhu'ayb (may Allah have mercy on him) that Sayyiduna Umar bin al-Khattab (may Allah be pleased with him) gave Sayyiduna Abdullah bin al-Sa'di (may Allah be pleased with him) a thousand dinars, but he refused to accept them. Then Sayyiduna Umar (may Allah be pleased with him) said to him: "I say to you what the Messenger of Allah (peace and blessings be upon him) said to me. He (peace and blessings be upon him) said: 'When Allah Almighty sends you some provision without your asking and without your soul's craving or greed for it, then take it, for it is Allah who has given it to you.'"
No one narrated this hadith from Qabisah bin Dhu'ayb (may Allah have mercy on him) except Abdullah bin Yazid al-Ma'afiri (may Allah have mercy on him), and no one from Abdullah bin Yazid (may Allah have mercy on him) except Bakr bin Sawadah (may Allah have mercy on him), while Ibn Lahi'ah (may Allah have mercy on him) is alone in narrating it.
Hadith Referenceالمعجم الأوسط / باب العين / 4823
Hadith Takhrij«أخرجه ابن حبان فى «صحيحه» برقم: 3403»