Tanya for the 6th of Cheshvan, ו' חשון

The study of issur and hetter does not supersede the obligation to pray at fixed times, even though the prayers were arranged according to the secrets of the Zohar and the supernal unions, whereas the fact is that for those individuals whose only occupation is the study of Torah, the study of issur and hetter does indeed take precedence over the mitzvah of prayer.