God is not looking for volunteers, he is looking for believers to be available in some way for him. This could be as simple as giving a cup of cold water in his name. Whatever the Lord has called you to do the scriptures says BE AVAILABLE to advance further praise and glory to our Lord Jesus Christ.
Bible Scriptures: Darby Translation
Exodus 21:1-6 “And these are the judgments which thou shalt set before them. If thou buy a Hebrew bondman, six years shall he serve; and in the seventh he shall go out free for nothing. If he came in alone, he shall go out alone: if he had a wife, then his wife shall go out with him. If his master have given him a wife, and she have borne him sons or daughters, the wife and her children shall be her master’s, and he shall go out alone. But if the bondman shall say distinctly, I love my master, my wife, and my children, I will not go free; then his master shall bring him before the judges, and shall bring him to the door, or to the door-post; and his master shall bore his ear through with an awl; and he shall be his bondman for ever.”
1 Chronicles 26:1-6 “The divisions of the doorkeepers. Of the Korahites: Meshelemiah the son of Kore, of the sons of Asaph. And Meshelemiah had sons: Zechariah the firstborn, Jediael the second, Zebadiah the third, Jathniel the fourth, Elam the fifth, Johanan the sixth, Elioenai the seventh. And the sons of Obed-Edom: Shemaiah the firstborn, Jehozabad the second, Joah the third, and Sacar the fourth, and Nethaneel the fifth, Ammiel the sixth, Issachar the seventh, Peulthai the eighth: for God had blessed him. And to Shemaiah his son were sons born, who were rulers in their father’s house; for they were mighty men of valour.”
Romans 12:1- 2 “I beseech you therefore, brethren, by the compassions of God, to present your bodies a living sacrifice, holy, acceptable to God, [which is] your intelligent service. And be not conformed to this world, but be transformed by the renewing of [your] mind, that ye may prove what [is] the good and acceptable and perfect will of God”