For you remember, brothers, our labor and travail; for working night and day, that we might not burden any of you, we preached to you the Gospel of God.
For labouring night and day - That is, when he was not engaged in preaching the gospel. He appears to have labored through the week and to have preached on the Sabbath; or if engaged in preaching in the day time during the week, he made it up by night labor.