“And we used to belie the day of religion until the certainty came upon us”
Regarding the above verse, Imam Sadiq (as) said, “The day of religion” refers to the day (of the rising) of the Qaem (as).
“Until the certainty came upon us”. “Certainty” refers to the time of the Qaem (as). (Tafseer Furat Bin Ibrahim page 194)