Abu 'Abdur Rahman al-Salmi أبو عبد الرحمن السلمي · Chapters on Supplication

“I said to Umm Salamah: ‘O Mother of the Believers! What was the supplication that the Messenger of Allah (ﷺ) said most frequently when he was with you?” She said: ‘The supplication he said most frequently was: “O Changer of the hearts, make my heart firm upon Your religion (Yā Muqallibal-qulūb, thabbit qalbī `alā dīnik).’” She said: ‘So I said: “O Messenger of Allah, why do you supplicate so frequently: ‘O Changer of the hearts, make my heart firm upon…

“Khalid bin Al-Walid al Makhzumi complained to the Prophet (ﷺ) saying: ‘O Messenger of Allah, I do not sleep at night due to insomnia.’ So Allah’s Prophet (ﷺ) said: ‘When you go to your bed, say: O Allah, Lord of the Seven Heavens and what they have shaded, Lord of the earths and what they carry, Lord of the Shayatin and those they have misguided, be for me a Protector against the evil of Your creation, all of them together,…

“The Messenger of Allah (ﷺ) said to us: ‘Hold fast to At-Tasbih, At-Tahlil, and At-Taqdis, and count them upon the fingertips, for indeed they shall be questioned, and they will be made to speak. And do not become heedless, so that you forget about the Mercy (of Allah).’”