dia, intensive, and bebaioo, to confirm, make sure, denotes to assert strongly, "affirm confidently," 1Ti 1:7, Tit 3:8 (AV, "affirm constantly").
<2,,1340, diischurizomai>
as in No. 1, and ischurizosai, "to corroborate" (ischuros "strong;" see ABILITY, A, No. 2 and C, No. 2 note), primarily signifies "to lean upon," hence, "to affirm stoutly, assert vehemently," Luk 22:59, Act 12:15.
<3,,5335, phasko>
a frequentative form of the verb phemi (No. 4), denotes "to allege, to affirm by way of alleging or professing," Act 24:9 (RV, "affirming," AV, "saying"); Act 25:19, Rom 1:22, "professing." Some mss. have it in Rev 2:2, instead of the verb lego, "to say." See PROFESS, SAY.
<4,,5346, phemi>
"to say" (primarily by way of enlightening, explaining), is rendered "affirm" in Rom 3:8. See SAY.