Ps.107:2(Amp) says, "Let the Redeemed of the Lord say so whom He has Redeemed from the adversary."
Gal.3:13(Amp) says, "Christ purchased our freedom (redeeming us) from the Curse (doom) of the Law (and its condemnation) by (Himself) becoming a curse for us; for it is written (in the scriptures) cursed is everyone who hangs on a tree (is crucified)."
When we "Say so," what do we say? Can we go to what is written in the Curse and stand against it, by saying what the word says? If a disease comes to you, then can you go to God's Word, find that disease, then say, "I am Redeemed from that," expecting to be delivered from that disease? When you were a sinner, you believed Rom.10:9(Amp) which says, "Because if you acknowledge and confess with your lips and in your heart your heart believe (adhere to, trust in, and rely on the Truth) that God raised Him from the dead, you will be saved" and you were saved. You received Jesus as your Lord and Savior and became a new creation in Christ. God's Word says, "Your sins and iniquities I will remember no more." Is that true? 1Cor.2:12 says, "You have now become a child of God and He has given you the Holy Spirit." Is that true?
When God instructs us to "Say so whom the Lord has delivered from the hand of the adversary," then why wouldn't we believe and stand, repeat His Word and stand on His Word about our healing? Which part of God's Word is true and which is not true? It is all True! We haven't been taught all that the Redemption Jesus provided, so we never put our faith in this. Every believer must learn and practice saying what the Word says, so we won't believe when others say, "God doesn't do this for everyone" or "You never know what God will do." If we attended a school that never taught addition, does that take away the fact that addition works and that it works for everyone who will believe and use it?
Paul told Timothy in 2Tim.2:15 to, "Study and show yourself approved." There were people all around who were still teaching The Law and traditions of The Law, to Christians. Timothy needed to distinguish between the Truth and the wrong things being taught. Paul wrote to the church in Gal.1:6(Amp), "I am surprised and astonished that you are so quickly turning renegade and deserting Him Who invited and called you by the Grace (unmerited favor) of Christ (the Messiah) (and that you are transferring your allegiance) to a different (even an opposition) gospel."
Just because we haven't been taught some of these Truths of God's Word, doesn't mean they're not for us today or that they've passed away. God's Word will never pass away according to Ps.119:89(Amp) which says, "Forever, O Lord, Your Word is settled in Heaven (stands firm as the heavens)."
Have you noticed how in these Last Days, everything is constantly changing and what was once true, isn't true any longer? The little knowledge we gleaned will not sustain us in these times. We must study God's Word, in order to show ourselves approved before God. This doesn't mean that we're not saved or that our faith is void, but that we need to keep learning God's Word to keep us from certain things while we're still here.
It's time we began to believe God for His Protection from things here on earth, as well receiving us into His House, when we leave here. We have work to do while we're still here on earth and need to learn to believe God will take care of us, while we work for the Kingdom. Read the scriptures quoted above and find out what we are to "Say So."