OET interlinear HERO (JDG) 15:7

uW Translation Notes:

Note 1 topic: grammar-connect-condition-fact

אִֽם־תַּעֲשׂ֖וּ⁠ן כָּ⁠זֹ֑את כִּ֛י אִם־נִקַּ֥מְתִּי

if (Some words not found in UHB: and=he/it_said to/for=them Shimshvōn/(Samson) if you(pl),will_do like,this that/for/because/then/when if taken_revenge on,you(pl) and=after rest )

Samson is speaking as if this were a hypothetical possibility, but he means that it is actually true. If your language does not state something as a condition if it is certain or true, then you could translate this as a confident statement. Alternate translation: [Since you have done such a thing, I am entitled to avenge myself]

Note 2 topic: figures-of-speech / explicit

וְ⁠אַחַ֥ר אֶחְדָּֽל

and=after (Some words not found in UHB: and=he/it_said to/for=them Shimshvōn/(Samson) if you(pl),will_do like,this that/for/because/then/when if taken_revenge on,you(pl) and=after rest )

Samson assumes that the Philistines will understand that he means he will stop fighting once he has avenged himself because he feels that will make them even. You could say that explicitly if it would be helpful to your readers. Alternate translation: [then that will make us even, so I will stop fighting]