The Holy Days of God, and what they picture for mankind
Leviticus 23:1-2.
And the Lord spoke to Moses saying, Speak to the children of Israel, and say to them; “The feasts of the Lord, which you shall proclaim to be holy convocations, these are My feasts”.

These Holy Days show us a picture of God’s plan for salvation for all mankind.
These days are to be observed as listed here in Leviticus 23 because He has commanded that they should be kept by His people! And they are to keep them in their ”appointed times” as it tells us in Lev 24:4. And these “appointed times” are to be observed in their season.

Passover and the Days of Unleavened Bread

The Passover lamb was killed on the 14th day of Nisan and this was eaten with unleavened bread and bitter herbs right on into the evening. On this day the Israelites were to put the blood of the lamb on their doorposts of so that the death angel would pass over them but the Egyptians had no such protection and so they suffered the loss of all their first born from children to adults.

And on the 15th day of the month began the days of Unleavened bread and this was kept for seven days. The first day was a holy day and the seventh day was a holy day. Unleavened bread was eaten during these seven days, no leaven was to be eaten.
God’s people today keep these annual feast days for spiritual reasons because they serve to remind them of the importance of God’s plan for mankind. In 1 Corinthians 5:7-8 it tells us that we should ”purge out the old leaven” and that we should “keep the feast”!

Today, God’s people keep the Passover and partake of the emblems that Christ instituted on His final Passover meal here on earth. These emblems are the wine, which is a symbol of Jesus’ shed blood for sin,
the bread which represents the body of Jesus which was broken and beaten for all of us because Christ paid the ultimate price for everyone. In John 6 it tells us about how of Christ is the “Bread of Life”. And so when we eat of the bread we eat of Christ and in Isaiah 53:4,5 it tells us there, that by His “stripes” are we healed. See also, I Peter 2:24.
The foot washing. The reasons for partaking of the foot washing is because Jesus set us an example to follow in John 13: 12-17.  This footwashing is a sign of humility and the greatest person that ever partook of this is Christ Himself! and so we follow what He has taught us. The Passover then is showing how Christ’s sacrifice is not just for a few but for the whole world!