Surah 47. Muhammad, Ayah 26

Lit., "this, because . . .", etc.

Lit., "in some [or "parts of"] the matter": i.e., "although we cannot agree with you [atheists] as regards your denial of God, or of resurrection, or of the fact of revelation as such, we do agree with you that Muhammad is an impostor and that the Qur'an is but his invention" (Razi). By "those who turn their backs [on this message] after guidance has been vouchsafed to them" are meant, in the first instance, the hypocrites and half-hearted followers of Islam at the time of the Prophet who refused to fight in defence of the Faith; in a wider sense, however, this definition applies to all people, at all times, who are impressed by the teachings of the Qur'an but nevertheless refuse to accept it as God-inspired and, therefore, morally binding.

 i.e., your opposition to the Prophet (ﷺ).

They have become so impervious to facts and truths, because, without the courage to oppose Allah's Cause openly, they secretly intrigue with Allah's enemies, and say that they will follow them part of the way, and by remaining partly in the other camp, they will be far more useful as spies and half-hearted doubters than by going over altogether. If they think that this game will be successful, they are mistaken. All the inner secrets and motives of their hearts are known to Allah. Cf. lix. 11.