They do know the favours of God, and yet they deny them, for most of them are not grateful.
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Tafseer
'Abdullāh Ibn 'Abbās / Muḥammad al-Fīrūzabādī
تفسير : when the prophet (pbuh) mentioned to them all those blessings, they agreed that all those blessings came from allah, but then they denied this afterward, and said: no, we have all these blessings through the intercession of our gods. allah said in response: (they know the favour of allah) they acknowledge that all these blessings are from allah (and then deny it) saying: we got them through the intercession of our gods. (most of them are ingrates) all of them are disbelievers in allah.
Jalāl al-Dīn al-Maḥallī
تفسير : they recognise god’s grace, that is, they affirm that it comes from him, and then deny it, by associating others [with him], and most of them are ungrateful.