Riyad as-Salihin 1489

I asked Umm Salamah (radiyallahu anha), “O Mother of the Believers! Which supplication did the Messenger of Allah (sallallahu alayhi wa sallam) make frequently when he was in your house?” She said: “He (sallallahu alayhi wa sallam) supplicated frequently: ‘Ya muqallibal-qulubi, thabbit qalbi ‘ala dinika (O Controller of the hearts make my heart steadfast in Your religion).’.’”