Render again unto God (twi qewi antapodounai). Second aorist active infinitive of double compound verb ant-apodidwmi, to give back (apo) in return for (anti). Old verb rare in N.T., but again in 2 Thessalonians 1:6 . For you (peri umwn). Around (concerning) you, while in verse 1 Thessalonians 3:2uper (over is used for "concerning your faith." For (epi). Basis again as cause or ground for the joy. Wherewith we joy (h cairomen). Probably cognate accusative hn with cairomen attracted to locative carai ( Matthew 2:10 ).