Jami At Tirmidhi
284
Sahih+2

Ibn Abbas narrated:"Between the two prostrations, the Prophet would say: (Allahummaghfir li, warhamni, wajburni, wahdini, warzuqni). 'O Allah! Pardon me, have mercy on me, help me, guide me, and grant me sustenance

SahihAhmad Muhammad Shakir
SahihAl-Albani