Musnad Abu Ya'la al-Mawsili 2:28

Narrated to us Ibn Numayr, narrated to us my father, narrated to us Hisham bin Sa'd, from Zayd bin Aslam, from his father, from Umar bin al-Khattab, who said: I said, "O Messenger of Allah, did you not say to me that it is better for you not to ask anyone among the people for anything?" He said, "That only applies if you ask. But whatever Allah gives you without you asking, then it is a provision that Allah has provided for you."