﴿ وَأَمَّا مَنْ خَافَ مَقَامَ رَبِّهِۦ وَنَهَى ٱلنَّفْسَ عَنِ ٱلْهَوَىٰ ﴾

“But unto him who shall have stood in fear of his Sustainer's Presence, and held back his inner self from base desires,”

(But as for him who feared) upon committing a sin (to stand before his Lord) his standing before his Lord and abstains from engaging in sin (and restrained his soul from lust) from that which is unlawful, even though he desires it, this refers to Mus'ab Ibn 'Umayr.