On this first occurrence of Passover—the actual “passing over” of Yehovah, occurred after the enactment of the seven-day Feast of Unleavened Bread began, which was on Wednesday at sundown, because Yehovah came at midnight, which followed the start of the fifteenth of Aviv. All Hebrew days start in the evening after sundown (evening and the morning). During the afternoon of the fourteenth of Aviv, Israel was to roast the lambs and have the “Passover (Seder) meal.” After sundown on Wednesday, they began the seven day feast of unleavened bread. The actual death of the firstborn occurred on the fifteenth day of Aviv around midnight of April 24, the dark hours of Thursday morning.