عَنْ سَلْمَانَ رضي الله عنه قَالَ: قَالَ رَسُولُ اللَّهِ صَلَّى اللهُ عَلَيْهِ وَسَلَّمَ: «إِنَّ رَبَّكُمْ حَيِيٌّ كَرِيمٌ، يَسْتَحْيِي مِنْ عَبْدِهِ إِذَا رَفَعَ يَدَيْهِ إِلَيْهِ أَنْ يَرُدَّهُمَا صِفْرًا».
The Prophet (may Allah's peace and blessings be upon him) encourages raising the hands during supplication and informed that Allah Almighty is (Bashful), possessing great bashfulness, and does not withhold giving. He does for the slave what brings him joy and refrains from what harms him. (Munificent) as He gives without being asked, so how much more after being asked!
He feels bashful of His believing slave to return his hands empty of His answer and disappointed after they have been raised in supplication.
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