PS100 stands for Psalm 100, Shout For Joy!

Shout for joy to the LORD, all the earth. Worship the LORD with gladness; come before him with joyful songs.

Know that the LORD is God. It is he who made us, and we are his; we are his people, the sheep of his pasture.

Enter his gates with thanksgiving and his courts with praise; give thanks to him and praise his name.

For the LORD is good and his love endures forever; his faithfulness continues through all generations. Psalm 100

In the beginning, God created the heaven and the earth. Genesis 1:1

for all people have sinned and fall short of the glory of God, and are justified by his grace as a gift, through the redemption that is in Christ Jesus, whom God put forward as a propitiation by his blood, to be received by faith. This was to show God’s righteousness, because in his divine forbearance he had passed over former sins. It was to show his righteousness at the present time, so that he might be just and the justifier of the one who has faith in Jesus. Romans 3:23-36

Jesus said “And this gospel of the kingdom will be proclaimed throughout the whole world as a testimony to all nations, and then the end will come.” Matthew 24:14

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Then the eleven disciples went away into Galilee, into a mountain where Jesus had appointed them. And when they saw him, they worshipped him: but some doubted. And Jesus came and spake unto them, saying, All power is given unto me in heaven and in earth. Go ye therefore, and teach all nations, baptizing them in the name of the Father, and of the Son, and of the Holy Ghost: Teaching them to observe all things whatsoever I have commanded you: and, lo, I am with you alway, even unto the end of the world. Amen. (Matthew 28:16-20)