Tafsir of Al-A'raf 7:206

إن الذين عند ربك ﻻ يستكبرون عن عبادته ويسبحونه وله يسجدون

but they glorify His praise and prostrate themselves before Him. Prostration, here, upon the mention that the angels prostrate to Allah is legitimate. A Hadith reads;

أﻻ تصفون كما تصف المﻼيكة عند ربها يتمون الصفوف اﻻول فاﻻول ويتراصون في الصف

Why not you stand in line (for the prayer) like the angels stand in line before their Lord! They continue the first then the next lines and they stand close to each other in line. This is the first place in the Qur'an where it has been legitimized -- according to the agreement of the scholars -- for the readers of the Qur'an, and those listening to its recitation, to perform prostration. This is the end of the Tafsir of Surah A'raf. All praise and gratitude is due to Allah, and Allah may He be glorified and exalted, knows best