Vincent's NT Word Studies
10. Only. With only this stipulation.We should remember (mnhmoneuwmen). The only instance in N.T. of this verb in the sense of beneficent care. No instance in LXX. In Psalm ix. 12, there is the thought but not the word.
The poor (twn ptwcwn). The poor Christians of Palestine. Comp. Acts xxiv. 17; Rom. xv. 26, 27; 1 Cor. xvi. 3; 2 Cor. ix. 1. For the word, see on Matt. v. 3. In LXX ordinarily of those who are oppressors, or of those who are quiet in contrast with the lawless.
The same which (o - auto touto). Lit. which, this very thing. The expression is peculiarly emphatic, and brings out the contrast between Judaising hostility and Paul's spirit of loving zeal. Rev. which very thing.
Robertson's NT Word Studies
2:10 {Only} (monon). One item was emphasized. {We should remember} (mnemoneuwmen). Present active subjunctive, "that we should keep on remembering." {Which very thing} (ho--auto touto). Repetition of relative and demonstrative, tautology, "which this very thing." In fact Barnabas and Saul had done it before (#Ac 11:30). It was complete victory for Paul and Barnabas. Paul passes by the second public meeting and the letters to Antioch (#Ac 15:6-29) and passes on to Peter's conduct in Antioch.