The best thing we can do for Israel is to pray and declare God’s Word over them. His Word will not return to Him without having accomplished what He sent it to do. Here is a good Psalm to use as a weapon!
“If the Lord had not been on our side— let Israel say—
if the Lord had not been on our side when people attacked us,
they would have swallowed us alive when their anger flared against us;
the flood would have engulfed us, the torrent would have swept over us,
the raging waters would have swept us away.
Praise be to the Lord who has not let us be torn by their teeth.
We have escaped like a bird from the fowler’s snare;
the snare has been broken, and we have escaped.
Our help is in the name of the Lord, the Maker of heaven and earth.”