The Quran

فَفَهَّمناها سُلَيمانَ ۚ وَكُلًّا آتَينا حُكمًا وَعِلمًا ۚ وَسَخَّرنا مَعَ داوودَ الجِبالَ يُسَبِّحنَ وَالطَّيرَ ۚ وَكُنّا فاعِلينَ

Muhammad Asad

for, [though] We made Solomon understand the case [more profoundly], yet We vouchsafed unto both of them sound judgment and knowledge [of right and wrong].¹And We caused² the mountains to join David in extolling Our limitless glory, and likewise the birds:³ for We are able to do [all things].

I.e., the fact that Solomon's judgment was more profound did not disprove the intrinsic justice of David's original judgment or deprive it of its merit.
Lit., "We compelled".
A reference to the Psalms of David, which call upon all nature to extol the glory of God - similar to the Qur'anic verses, "The seven heavens extol His limitless glory, and the earth, and all that they contain" (17:44), or "All that is in the heavens and on earth extols God's limitless glory" (57:1).