The Savoy Declaration; A Church Covenant
They shall ask the way to Zion with their faces thitherward, saying, Come, and let us join ourselves to the Lord in a perpetual covenant that shall not be forgotten. (Jeremiah 50:5)
And this they did, not as we hoped, but first gave their own selves to the Lord, and unto us by the will of God. (2 Corinthians 8:5)