Sahih Adab al-Mufrad

It is narrated from Sayyiduna Shakl bin Humaid, may Allah be pleased with him, that he said: I said, "O Messenger of Allah! Please teach me a supplication from which I may benefit." The Prophet (peace and blessings of Allah be upon him) said: "Say: «الله عافني من شر سمعي، وبصري، ولساني، وقلبي، وشر منيي» O Allah! Protect me from the evil of my hearing, my sight, my tongue, my heart, and my semen." Waki’ said: "Semen means adultery and immorality."