Mishkat al-Masabih #899

Shaddad b. Aus said that God's Messenger used to say in his prayer, “O God, I ask Thee for steadfastness in carrying out what I am commanded and resolution in following right guidance. I ask Thee to make me grateful for Thy favour and to enable me to worship Thee acceptably. I ask Thee for a sound heart and a truthful tongue. I ask Thee for some of the good of what Thou knowest, I seek refuge in Thee from the evil of what Thou knowest, and I ask Thy forgiveness for what Thou knowest.” Nasa’i transmitted it, and Ahmad transmitted something similar.