How sound is the story about Moses (peace be upon him) asking his Lord to show him his companion in Paradise, whereupon it was revealed to him that his companion was a butcher devoted to his mother?

The topic's encouragement for filial piety is sound and good. The responsiveness of a mother's prayer for her child is affirmed by a Hadith narrated by Tirmidhi: "Three supplications are answered without a doubt: the supplication of a parent for his child..." As for the story of Musa, it has no basis. What is sufficient is what has been mentioned in the Qur'an and the authentic Sunnah regarding the virtues of filial piety. One can refer to books such as Riyad al-Salihin, al-Targhib wal-Tarhib, al-Matjar al-Rabih, and al-Adab al-Mufrad.