'Labor' in the Bible

remembering without ceasing your work of faith and labor of love and patience of hope in our Lord Jesus Christ, before our God and Father;

For ye remember, brethren, our labor and travail: working night and day, that we might not burden any of you, we preached unto you the gospel of God.

For this cause I also, when I could no longer forbear, sent that I might know your faith, lest by any means the tempter had tempted you, and our labor should be in vain.

But we beseech you, brethren, to know them that labor among you, and are over you in the Lord, and admonish you;