﴿ ۞ وَلَقَدْ ءَاتَيْنَا دَاوُۥدَ مِنَّا فَضْلًۭا ۖ يَٰجِبَالُ أَوِّبِى مَعَهُۥ وَٱلطَّيْرَ ۖ وَأَلَنَّا لَهُ ٱلْحَدِيدَ ﴾

“AND [thus], indeed, did We grace David with Our favour: “O you mountains! Sing with him the praise of God! And [likewise] you birds!” And We softened all sharpness in him,”

Please check ayah 34:11 for complete tafsir.