What should a questioner do regarding his past prayers that he missed out of ignorance and numerous expiations for oaths, given his retraction from a promise he made to a scholar who gave him a fatwa against making them up, and the scholar's threat to contend with him on the Day of Resurrection and take his good deeds?

The man's information to you that the view of not requiring make-up prayers and that you only owe one expiation is a view held by some scholars, differing from the view of the majority, is correct. What is obligatory upon you is to follow someone whose knowledge and piety you trust. Being cautious, making up those prayers, and atoning for the oaths is better and more preferable, as it ensures certain acquittal of responsibility, in accordance with the hadith (definition): "Leave that which makes you doubt for that which does not make you doubt." No one has the right to compel you to act upon their statement, and their statement is not binding upon you. His claim of demanding your good deeds on the Day of Judgment is a clear error on his part. We advise caution in matters of religion and ensuring certain acquittal of responsibility. However, if you act upon a fatwa (definition) from a scholar whom you trust, there is no blame upon you.