A.T. Robertson Commentary 1 Thessalonians 3:8

"for now we live, if ye stand fast in the Lord." — 1 Thessalonians 3:8 (ASV)

If ye stand fast (εαν υμεις στηκετε). Condition of first class, εαν and present active indicative (correct text, not στηκητε subj.) of στηκω, late form from perfect εστηκα of ιστημ, to place.