1 - There is the Lamb of God  

John 1
29. The next day John saw Jesus coming toward him and said,
"Look! There is the Lamb of God who takes away the world's sin!
LB

The John spoken of here is John the Baptiser, who was sent to announce to Israel the coming of the Messiah, or Saviour, Jesus Christ.
So why did John refer to Jesus as "the Lamb of God"?

God often gave His people object lessons so they could understand deep spiritual concepts. The object lesson of the Lamb was one of these.

In the time of Moses, hundreds of years before John's time, God needed to take His people out of the land of Egypt, but they were slaves there, and the king would not let them go.

God took several actions to convince the king to let His people go, but the king kept refusing to do so.
At last, God told Moses that the people of Israel were to take a perfect, one-year-old lamb and keep it in their homes for about 2 weeks.

On the appointed night they were to kill that lamb, collect its blood in a basin and apply the blood of the lamb to the sides and tops of the front door-posts of their homes, using as a brush, the branch of a plant that grew all around them.

That night God would send the Death Angel over the land of Egypt to kill the eldest of every human and animal family, from the king on down.
But, God said, "When I see the blood of the Lamb, I will pass over your house and your family will be spared the loss."

For hundreds of years after that first time, the people of Israel repeated this object lesson of the lamb each year at a feast they called the Passover, to commemorate when the Death Angel passed over their homes because of the blood of the Lamb.

Each time the Passover was celebrated, each family killed A lamb.
John was saying to the nation about the Lord Jesus:
"This man is THE LAMB of God.
From this time on, God will not just pass over your sins.
THE LAMB of God will take your sins away completely. After He has done this, there will be no need for any more lambs to represent Him.
He is THE LAMB of God, whose blood has the ability to take away entirely, the sin of the entire world."

Prayer:
Father, today we thank You for sending the Lord Jesus Christ into the world to be THE Lamb of God.
Lord Jesus, thank You for being willing to come and take my place and pay for my sin with Your blood.
Thank You for being the Lamb of God for me,
in Your wonderful name I pray,
Amen.