ISB ~ 1 Thessalonians 2 v9

labor and toil:As apostles, Paul and his coworkers are entitled to financial and material support from the communities under their care (Lk 10:7; 1 Cor 9:13-14). But during their brief stay with the Thessalonians, they waived this right to avoid loading the Church down with burdens and to show that their ministry was not driven by greed or self-interest. It is not specified how the missionaries supported themselves, but we know that Paul was a tentmaker by trade (Acts 18:3).

night and day:Accentuates how tirelessly the apostles worked in order to provide for themselves and to continue their ministry at the same time. Paul, for one, was glad to spend himself in this way (2 Cor 12:15).