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.