Surah As-Saffat 37:106
إِنَّ هَـٰذَا لَهُوَ ٱلْبَلَـٰٓؤُا۟ ٱلْمُبِينُ
Indeed, this was the clear trial.
Translation: Saheeh International
Tafsir
Truly this sacrifice to which he was commanded was indeed a clear test’ that is to say the ultimate test of faith.
Excerpt from Tafsir al-Jalalayn, commentary on 37:106, via Quran.com. The reader has the full commentary and 9 more tafsirs.