Explanation of the Hadith of 'Aishah: Whoever does an act for which we have no command

Question:
May Allah keep you safe, Your Eminence the Shaykh! Truly, this hadith is a great hadith, the hadith of 'Aishah. Do you have an explanation for it and a reflection on it from a worker?

Answer:
There are two wordings. One of them is agreed upon by al-Bukhari and Muslim, and in a wording of Muslim it says: "Whoever does an act that is not an act, it is rejected." This is in matters of worship: whoever innovates a worship, it is rejected from him. Likewise, whoever forbids what Allah has not forbidden or obligates what Allah has not obligated, it is rejected from him. As for if he engages in what Allah has forbidden, it is forbidden due to other proofs. If he wears stolen goods, or enters stolen land, or buys with forbidden dirhams, this is absolutely forbidden; it is not specific to prayer. It is not that it is not in accordance with the command of the Prophet (peace and blessings be upon him), but rather it must be rejected. And this does not necessitate the invalidity of the prayer; rather, it is forbidden for him to do a stolen act, or to buy with a forbidden price.