Indeed We had, before this, granted Abraham discretion and his particular consciousness of truth, and We knew him very well (in all aspects of his character)
And surely, We awarded Ibrahim (Abraham) understanding and guidance (commensurate with his rank) well before, and We knew him full well (his competence and capability)
And indeed We bestowed aforetime on Ibrahim (Abraham) his (portion of) guidance, and We were Well-Acquainted with him (as to his Belief in the Oneness of Allah, etc.)
Indeed, We gave maturity (mature thought – the quality of being a Hanif) to Abraham before this... And We knew him well.
Sayyed Abbas Sadr-Ameli
And indeed We gave Abraham aforetime his rectitude, and We were aware of him (his eligibilities)
Al-muntakhab fi tafsir al-Qur'an al-Karim
Aforetime, We directed Ibrahim to reasoning and to employ the faculty of reason in forming conclusions and We were fully aware of his thoughts and of his innermost being