"And that I may guide you to your Lord," meaning: that I might explain to you the religion of your Lord, "so that you may fear" God.
﴿وأهديك إِلَى رَبك﴾ أَيْ: وَأُبَيِّنُ لَكَ دِينَ رَبِّكَ ﴿فتخشى﴾ الله.
