NT-EPISTLES.filter - kjv labouring:

kjv@Colossians:4:12 @ Epaphras, who is one of you, a servant of Christ, saluteth you, always labouring fervently for you in prayers, that ye may stand perfect and complete in all the will of God.

kjv@1Thessalonians:2:9 @ For ye remember, brethren, our labour and travail: for labouring night and day, because we would not be chargeable unto any of you, we preached unto you the gospel of God.