3 in the bible, especially as in “the third day” means divine perfection, reconciliation of duality, and analogy to the Trinity
on the 3rd day the Lord will come down from Mt Sinai before the eyes of all the people Ex19:11
Jonah in the belly of the whale foreshadowing Christ’s time in the tomb as Matt 2:40 uses it “so will the Son of Man be in the belly of the earth for three days and three nights.” It is not a literal 72 hour period to the second but an analogy.
the 3 days are, sundown Holy Thursday and the beginning of the Passover meal/Lord’s supper to sundown Good Friday, the entire period being the accomplishment of the Paschal Sacrifice, Sundown Good Friday just after the entombment to Sundown Saturday when the Vigil begins. Beginning of the Vigil to midnight Easter Sunday, the entire period of the resurrection, post resurrection appearances to Mary Magdelene and several disciples, including on the road to Emmaus toward sundown, the appearance to the disciples that night. All encompass one event, the 3 days signifying completeness of the divine action and revelation of the action of the Trinity.