Is it permissible to visit a disbeliever for the purpose of calling him to Islam and encouraging him in it?

Question:
May Allah reward you, Honorable Shaykh. This questioner asks: Is it permissible to visit a disbeliever for the purpose of bringing him into Islam and encouraging him in it?

Answer:
Yes, the Prophet (peace and blessings be upon him) visited his uncle Abu Talib when death was near, and called him to Islam. He also visited a Jew who served him; when death was near for the Jew, the Prophet (peace and blessings be upon him) visited him and called him to Islam, so he embraced Islam and died upon Islam.
So visiting a sick person in order to call him to Islam—visiting a sick disbeliever in order to call him to Islam—is a good thing.
So that Allah may seal his affair with Islam, and you may be the cause of his salvation. For this reason, when the Jew embraced Islam, the Prophet said: Yes.