Cross Reference 2 CHRONICLES 30:3 FOR THEY COULD NOT KEEP IT AT THAT TIME BECAUSE THE PRIESTS HAD NOT SANCTIFIED THEMSELVES SUFFICIENTLY NEITHER HAD THE PEOPLE GATHERED THEMSELVES TOGETHER TO JERUSALEM

{2 Chronicles 30:3} For x3588 they could 3201 z8804 not x3808 keep 6213 z8800 it at that x1931 time, 6256 because x3588 the priests 3548 had not x3808 sanctified y6942 z8694 themselves x6942 sufficiently, 4078 z8676 y1767 neither x3808 had the people 5971 gathered themselves together 622 z8738 to Jerusalem. 3389

at that time:
"And ye shall keepª ¹ it up until¹ the fourteenthª ª dayª of the same¹ month:ª and the wholeª assemblyª of the congregationª of Israelª shall killª ° it inª the evening.ª" {Exd 12:6} + "In the firstª [month], on the fourteenthª ª dayª of the monthª at even,ª ye shall eatª ° unleavened bread,ª until¹ the oneª and twentiethª dayª of the monthª at even.ª" {Exd 12:18}

because:
"But¹ the priestsª were¹ too few,ª so that they couldª ° not¹ flayª °¹ all¹ the burnt offerings:ª wherefore their brethrenª the Levitesª did helpª ° them, till¹ the workª was ended,ª ° and until¹ the [other] priestsª had sanctified² ° themselves:¹ for¹ the Levitesª [were] more uprightª in heartª to sanctify² ° themselves¹ than the priests.ª ¹" {2Ch 29:34}