The ruling on adding to the prescribed remembrances, such as adding "Ar-Rahman Ar-Rahim" to the Basmalah during ablution

Question:
He says: Honorable Shaykh, may Allah grant you success, is there evidence in the hadith of al-Bara' ibn 'Azib, "And the Prophet whom You sent," that the remembrances are based on what was transmitted, such that it is not permissible to add "Ar-Rahman Ar-Rahim" to the Basmalah during ablution, and likewise for every remembrance?

Answer:
One should restrict oneself to saying "Bismillah" when eating and when slaughtering an animal. One should restrict oneself to saying "Bismillah" when drinking. As for "Ar-Rahman Ar-Rahim," one should restrict oneself to saying "Bismillah."