Sunan Ibn Majah, Volume 5, Book 37, Hadith 4164 (DarusSalam) ⓘ
‘Umar said: “I heard the Messenger of Allah say: ‘If you were to rely upon Allah with the reliance He is due, you would be given provision like the birds: They go out hungry in the morning and come back with full bellies in the evening.”
حَدَّثَنَا حَرْمَلَةُ بْنُ يَحْيَى، حَدَّثَنَا عَبْدُ اللَّهِ بْنُ وَهْبٍ، أَخْبَرَنِي ابْنُ لَهِيعَةَ، عَنِ ابْنِ هُبَيْرَةَ، عَنْ أَبِي تَمِيمٍ الْجَيْشَانِيِّ، قَالَ سَمِعْتُ عُمَرَ، يَقُولُ سَمِعْتُ رَسُولَ اللَّهِ ـ صلى الله عليه وسلم ـ يَقُولُ " لَوْ أَنَّكُمْ تَوَكَّلْتُمْ عَلَى اللَّهِ حَقَّ تَوَكُّلِهِ لَرَزَقَكُمْ كَمَا يَرْزُقُ الطَّيْرَ تَغْدُو خِمَاصًا وَتَرُوحُ بِطَانًا " .
also referenced under: Hadith 4164 (Reference) & Book 37, Hadith 4303 (In-Book)