وَٱعْبُدْ رَبَّكَ حَتَّىٰ يَأْتِيَكَ ٱلْيَقِينُ
And serve your Lord until certainty comes to you.
Roots in this verse: ع ب د (Ebd), ر ب ب (rbb), ا ت ي (Aty), ي ق ن (yqn)