Is it permissible to repeat a surah in the two rak'ahs?

Question : Here is a question: Is it permissible for a person to recite a surah in the two rak'ahs, meaning to repeat it twice?

Answer : The answer is yes, and there is no harm in that. The evidence is the action of the Messenger (peace and blessings be upon him), who recited "If the earth is shaken" in both rak'ahs, meaning he repeated it. But someone might say, perhaps the Prophet (peace and blessings be upon him) forgot, because his custom was not to repeat a surah. The answer to this is that the possibility of forgetting is plausible. We are human beings.
But the possibility of legislation is stronger, meaning that the Prophet (peace and blessings be upon him) repeated it as legislation for the Ummah to show the Ummah that it is permissible. The possibility of forgetting is more likely because the custom of the Messenger (peace and blessings be upon him) was not to repeat it.
The possibility of legislation is more likely because the default for the action of the Messenger (peace and blessings be upon him) is legislation, and if he had been forgetting, he would have been alerted to it, he would have been alerted to it. And this latter view, that it is a matter of legislation, is more cautious and closer to the truth, and it is permissible for a person sometimes to repeat the surah, and there is no harm in it.