How sound is the attribution of the saying: "Let none of you say: 'I will not supplicate until my faith is complete.' For he is between two matters: either he dies and his faith is not yet complete, or a day comes and he says: 'My faith is complete,' then let him know that he has gone astray" to Ibn Taymiyyah?

Humans are commanded to supplicate unconditionally, as it is one of the legitimate means to attract good and repel evil, and an act of worship that increases faith. Whoever abandons it misses out on much good. It is unimaginable for a believer to abandon supplication, as prayer itself is inseparable from supplication. There is no specific limit to the perfection of faith, and no one is permitted to testify to their own perfection. The quoted statement is correct, but it has not been found in the books of Shaykh al-Islam.