And Ittai answered the king, and said, As the LORD liveth, and as my lord the king liveth, surely in what place my lord the king shall be, whether in death or life, even there also will thy servant be. – 2 Samuel 15:21

Ittai gave himself up wholly to David when he was but newly come to him, David says, “Whereas thou camest but yesterday, should I this day make thee go up and down with us? But Ittai does not care whether he came yesterday or twenty years ago, but he declares, “Surely in what place my lord the king shall be, whether in death or life, even there also will thy servant be.” It is best to begin the Christian life with thorough consecration. Have any of you professed to be Christians, and have you never given yourselves entirely to Christ? It is time that you began again. This should be one of the earliest forms of our worship of our Master-this total resignation of ourselves to Him. According to His Word, the first announcement of our faith should be by baptism, and the meaning of baptism, or immersion in water, is death, burial, and resurrection. As far as this point is concerned, the avowal is just this. “I am henceforth dead to all but Christ, whose servant I now am. Henceforth let no man trouble me, for I bear in my body the marks of the Lord Jesus. The watermark is on me from head to foot. I have been buried with Him in baptism unto death to show that henceforth I belong to Him.” Now, whether you have been baptized or not I leave to yourselves, but in any case, this must be true-that henceforth you are dead, and your life is hid with Christ in God. As soon as ever Christ is yours you ought to be Christ’s. “I am my Beloved’s” should be linked with “My Beloved is mine,” in the dawn of the day in which you yield to the Lord. ~ C.H. Spurgeon

https://www.blueletterbible.org/Comm/spurgeon_charles/sermons/1512.cfm