وَحَدَّثَنِي عَنْ مَالِكٍ، عَنْ زَيْدِ بْنِ أَسْلَمَ، عَنْ عَطَاءِ بْنِ يَسَارٍ، أَنَّ رَسُولَ اللَّهِ صلى الله عليه وسلم أَرْسَلَ إِلَى عُمَرَ بْنِ الْخَطَّابِ بِعَطَاءٍ فَرَدَّهُ عُمَرُ فَقَالَ لَهُ رَسُولُ اللَّهِ صلى الله عليه وسلم ‏"‏ لِمَ رَدَدْتَهُ ‏"‏ ‏.‏ فَقَالَ يَا رَسُولَ اللَّهِ أَلَيْسَ أَخْبَرْتَنَا أَنَّ خَيْرًا لأَحَدِنَا أَنْ لاَ يَأْخُذَ مِنْ أَحَدٍ شَيْئًا فَقَالَ رَسُولُ اللَّهِ صلى الله عليه وسلم ‏"‏ إِنَّمَا ذَلِكَ عَنِ الْمَسْأَلَةِ فَأَمَّا مَا كَانَ مِنْ غَيْرِ مَسْأَلَةٍ فَإِنَّمَا هُوَ رِزْقٌ يَرْزُقُكَهُ اللَّهُ ‏"‏ ‏.‏ فَقَالَ عُمَرُ بْنُ الْخَطَّابِ أَمَا وَالَّذِي نَفْسِي بِيَدِهِ لاَ أَسْأَلُ أَحَدًا شَيْئًا وَلاَ يَأْتِينِي شَىْءٌ مِنْ غَيْرِ مَسْأَلَةٍ إِلاَّ أَخَذْتُهُ ‏.‏

Yahya related to me from Malik from Zayd ibn Aslam from Ata ibnYasar that the Messenger of Allah, may Allah bless him and grant himpeace, sent a gift to Umar ibn al-Khattab, and Umar returned it. TheMessenger of Allah, may Allah bless him and grant him peace, said,"Why did you return it?" He said, "Messenger of Allah, didn't you tellus that it is better for us not to take anything from anyone?" TheMessenger of Allah, may Allah bless him and grant him peace, said,"That is by asking. Provision which Allah gives you is different fromasking." Umar ibn al-Khattab said, "By the One in whose hand my selfis, I will not ask anything from anyone, and anything that comes to mewithout my asking for it, I will accept." Translation Not Available

Book Ref: Muwatta Imam Malik Book 58 Hadith 1852
Web Ref:  Muwatta Imam Malik Book 58 Hadith 9