Are there any supplications or righteous deeds that can help me purify my heart and my tongue?

Question:
You are asking, Honorable Shaykh Salih, are there any supplications or righteous deeds that help in purifying my heart and my tongue?

Answer:
Yes, there is no doubt that there are righteous deeds that help purify the heart and the soul, by performing acts of obedience and avoiding what is forbidden, and by increasing the remembrance of Allah (Mighty and Majestic), increasing the recitation of the Qur'an and reflecting on its meanings. All of this purifies the heart and purifies the soul. All acts of obedience, whether verbal or practical, whether outward or inward, purify the souls. Allah the Exalted said: meaning that he purified himself by obeying Allah (Glorified and Exalted is He) and restraining himself from what Allah has forbidden. This is how one attains success from Allah (Glorified and Exalted is He). Likewise, sins, evil deeds, evil words, evil actions, and all other sins defile the soul and affect the heart. Allah the Exalted said: meaning that he defiled himself and cast him into the dust, lowering him from the station Allah had given him, so that Allah might subdue him. In any case, acts of obedience purify the souls, and sins defile the souls. Yes. May Allah reward you with good, and may He do you good.