The ruling on saying "My Lord, forgive me and my parents" between the two prostrations

Question:
And saying: "My Lord, forgive me and my parents between the two prostrations"?

Answer:
If he says: "My Lord, forgive me and my parents" or: "O Allah, protect me from the Fire," it does not harm him; because it is a place for supplication. However, he should increase his saying: , just as the Prophet (peace and blessings be upon him) increased it. It was reported from him (peace and blessings be upon him): , and it was reported in it: . It contains supplications, but the best and most important of them is: . Some scholars even said that it is obligatory once, and what is added is a recommended practice (sunnah). The majority of scholars said that it is all a recommended practice (sunnah) and not obligatory: or: is a recommended practice (sunnah). But it is what he should aim for is ; because the Prophet (peace and blessings be upon him) used to say it and increase it, and that is what is appropriate.
The statement that it is obligatory is a strong opinion; because the Prophet (peace be upon him) used to say it, and he said: . If he says it once, that suffices him, and the best is to repeat it three times or more, along with saying: . And if he says: "O Allah, forgive me and my parents," or "O Allah, forgive me and the Muslims," or "O Allah, rectify our rulers," we do not know of any harm in it; because it is a place for supplication. Between the two prostrations is a place for supplication, and the Prophet (peace and blessings be upon him) used to lengthen it, lengthening what is between the two prostrations. But increasing in this position is better, and the obligatory part is once.