Commentaries:
Robertson's Word Pictures (NT)
If ye lend (ean danishte). Third-class condition, first aorist active subjunctive from danizw (old form daneizw) to lend for interest in a business transaction (here in active to lend and Matthew 5:42 middle to borrow and nowhere else in N.T.), whereas kixrhmi (only Luke 11:5 in N.T.) means to loan as a friendly act.
To receive again as much (ina apolabwsin ta isa). Second aorist active subjunctive of apolambanw, old verb, to get back in full like apexw in Luke 6:24. Literally here, "that they may get back the equal" (principal and interest, apparently). It could mean "equivalent services." No parallel in Matthew.
Other Robertson's Word Pictures (NT) entries containing Luke 6:34:
Luke 6:35
Luke 16:25
Romans 1:27
1 Peter 2:19
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