Allah is shy to return empty hands
إِنَّ رَبَّكُمْ حَيِيٌّ كَرِيمٌ، يَسْتَحْيِي مِنْ عَبْدِهِ إِذَا رَفَعَ يَدَيْهِ إِلَيْهِ أَنْ يَرُدَّهُمَا صِفْرًا
Inna Rabbakum hayiyyun karim, yastahyi min 'abdihi idha rafa'a yadayhi ilayhi an yaruddahuma sifra.
"Your Lord is Shy and Generous, He is shy, when His servant raises his hands to Him, to return them empty."
Narrated by Salman al-Farisi. Sunan Abi Dawud 1488, Jami' at-Tirmidhi 3556 (hasan)
A short reflection
Raise them anyway. Raise them often. Raise them at strange hours. Generosity is His attribute, not an event.