According to the gospels, Jesus arose from the dead on Sunday,
the third day after the crucifixion. All of Christendom accepts that
Jesus resurrected on Sunday. Since Jesus died three days before
Sunday, we must understand how biblical people counted three days at
the time of Moses or Jesus.
In our culture, if I said "Let's meet in three days,"
we would count tomorrow as the first day. Contrary to our society,
the biblical culture counts today as the first day. Consider how
each day is counted in the following Scripture.
When you sacrifice a fellowship offering to the
Lord, sacrifice it in such a way that it will be accepted on your
behalf. It shall be eaten on the day
you sacrifice it [1st
Day] or on the
next day [2nd
Day];
anything left over until the third
day [3rd
Day] must
be burned up. If any of it is eaten on the third day, it is impure
and will not be accepted(Lev.
19:5-7).
How are the three days counted in this verse? Consider how the
first day is counted by these two points:
- Today, the day of the sacrifice, counts as the first day.
- Today counts as a whole day, not part of a day.
We have found a 24 hour contrast between the way our culture
counts three days versus the biblical culture. In the verse above,
the only full 24 hour day is the second day. Finally, the third day,
a partial day, counts as a whole day. We can map this method of
counting as follows:

Applying this verse to Jesus' crucifixion, we realize that the
day of Jesus' death, Friday, counted as the first day. The only full
24-hour day was Saturday. Jesus' Sunday resurrection, a partial day,
counted as the third day.