The Messenger (peace and blessings be upon him) said: “A servant gets no benefit from his prayer except what he understands of it.” Is this hadith authentic?

Question:
The Messenger (peace and blessings be upon him) said: “A servant gets no benefit from his prayer except what he understands of it.” Is this hadith authentic?

Answer:
Yes, this was reported from the Prophet (peace and blessings be upon him) “Understands of it” means his heart is present.
In it, and Allah the Mighty and Majestic humbled them in it. As for the one who prays while his heart is preoccupied and not present in the prayer, he receives no reward for his prayer. However, he is not ordered to repeat it, because he prayed in appearance, but he has no reward in it because he did not humble himself in it. And Allah the Exalted says: So prayer is humility and presence before Allah, Glorified and Exalted is He, and what is intended by it is not merely bowing and prostrating. May Allah reward you with good, and may He do you good.