Tafsir of As-Saffat 37:106

Verily, that indeed was a manifest trial. meaning, it was clearly a test when he was commanded to sacrifice his son, so, he hastened to do it, in submission to the command of Allah and in obedience to Him. Allah said:

وإبرهيم الذى وفى

And of Ibrahim who fulfilled all that. (53:37) and,

وفديناه بذبح عظيم