He said: [Then with which of the favors] meaning: the blessings [of your Lord do you doubt] meaning: do you dispute? That is: you do not doubt.
قَالَ: ﴿فَبِأَي آلَاء﴾ يَعْنِي نعماء ﴿رَبك تتمارى﴾ تشك أَي: إِنَّك لَا تشك