Surah Saba, Verse 10
Translation — Sahih International
And We certainly gave David from Us bounty. [We said], "O mountains, repeat [Our] praises with him, and the birds [as well]." And We made pliable for him iron,
Source
Kur'an-ı Kerim, Sebe' Suresi 34:10
https://kuran.diyanet.gov.tr/mushaf/kuran-meal-2/34-suresi-10-ayet