And He left it as a Word to endure among those who would come after him, so that they may return (from worshipping false deities to the worship of One God)
And Ibrahim (Abraham) made that (formula of the Oneness of Allah) the lasting word amongst his descendants and race so that they may remain bent (towards Allah)
And he made it (i.e. La ilaha ill-Allah (none has the right to be worshipped but Allah Alone)) a Word lasting among his offspring (True Monotheism), that they may turn back (i.e. to repent to Allah or receive admonition)
He made this word a lasting thought throughout later generations, that perhaps they will turn back to the Truth.
Al-muntakhab fi tafsir al-Qur'an al-Karim
A dogma he founded and he legated to his posterity and to those who would succeed him, that they may hopefully keep Allah in mind and to Him they would lift their inward sigh