Leviticus1 verse 7-9

"And the sons of Aaron the priest shall put fire upon the altar, and lay the wood in order upon the fire."

As we discussed over the last few sessions the sacrifice typifies the sufferings and offering up of the Lord Jesus Christ. Here we have a reference to fire. Fire relates to several things in the scriptures, one of these being the suffering and trial that we have to go through as believers in the Lord.  (Daniel 3, 1Peter 1:7 That the trial of your faith, being much more precious than of gold that perisheth, though it be tried with fire, might be found unto praise and honour and glory at the appearing of Jesus Christ).  Jesus said to His disciples: Are ye able to drink of the cup that I shall drink of, and to be baptized with the baptism that I am baptized with? (Matt 20:20-23) On the cross Jesus had to suffer the cruel mockings of sinful men, but He also carried our sins on the cross and took upon Himself the punishment for these offences. So much so that the apostle Paul says that He became sin for us. (For he hath made him [to be] sin for us, who knew no sin; that we might be made the righteousness of God in him. 2  Cor5:21) This was the baptism to which Jesus was referring to - a baptism of fire. So when Jesus said that we had to take up our cross, this was also referring to this baptism. Now note that the offering is placed on wood: Jesus was crucified on a wooden cross. Thus the sacrifice of Christ on the cross satisfied the divine justice of Almighty God. Isaiah 53:12 says that , "He shall see of the travail of His soul, and be satisfied : by His knowledge shall my Righteous Servant justify many; for He shall bear their iniquities."