Umar reported that he heard the Prophet, peace be upon him, say
لَوْ أَنَّكُمْ تَوَكَّلْتُمْ عَلَى اللَّهِ حَقَّ تَوَكُّلِهِ لَرَزَقَكُمْ كَمَا يَرْزُقُ الطَّيْرَ تَغْدُو خِمَاصًا وَتَرُوحُ بِطَانًا
If you all depend on Allah with due reliance, He would certainly give you provision as He gives it to birds who go forth hungry in the morning and return with full belly at dusk.