Reference : Hisn al-Muslim 136

اللّهُـمَّ اكْفِـني بِحَلالِـكَ عَنْ حَـرامِـك،
وَأَغْنِـني بِفَضْـلِكِ عَمَّـنْ سِـواك
Allāhummak-finī biḥalālika `an ḥarāmik, 
wa 'aghninī bi faḍlika `amman siwāk.


O Allah, suffice me with what You have allowed instead of what You have forbidden, 
and make me independent of all others besides You.

Reference:
At-Tirmidhi 5/560. See also Al-Albani, Sahih At-Tirmidhi 3/180.

Chapter: Settling a debt