O Allah, I am fasting. O Allah, do not deprive me of the reward of those who fas — Fasting
اللَّهُمَّ إِنِّي صَائِمٌ اللَّهُمَّ لَا تَحْرِمْنِي أَجْرَ الصَّائِمِينَ
Transliteration: Allaahumma innee saa'im, Allaahumma laa tahrimnee ajras-saa'imeen
Translation: O Allah, I am fasting. O Allah, do not deprive me of the reward of those who fast.
Reference: General supplication