Jami` at-Tirmidhi Book 48, Hadith 220
“The Messenger of Allah (ﷺ) taught me, saying: ‘Say: “O Allah, this is the coming of Your night, and the departing of Your day, the voices of those calling to You, and the time of prayers to You, I ask You to forgive me (Allāhumma hādhastiqbālu lailika, wastidbāru nahārika, wa aṣwātu du`ātika wa ḥuḍūru ṣalawātika, as’aluka an taghfira lī).”
“Thabit Al-Bunani narrated to me, he said to me: ‘O Muhammad, when you suffer from some ailment, then place your hand at the place of the ailment, then say: “In the Name of Allah, I seek refuge in Allah’s might and power from the evil of this pain I feel (Bismillāh, a`ūdhu bi-`izzatillāhi wa qudratihī min sharri mā ajidu min waja`ī hādhā).” Then lift your hand and repeat that an odd number of times. For indeed, Anas bin Malik narrated to me, that the Messenger of Allah (ﷺ) narrated that to him.’”
“No worshipper has ever said: None has the right to be worshipped but Allah (Lā ilāha illallāh)’ sincerely, except that the gates of heaven are opened for it, until it reaches to the Throne, so long as he avoids the major sins.”