Quoting Commentary for II Kings 5:15

Such an one shall receive a blessing from the Lord, And righteousness from the God of his salvation: – Shall receive (ישׂא), i.e. shall take (יקח), as (Ruth 1:4), “And they took (וישׂאו) them wives.” A blessing on the analogy of (2 Kings 5:15), “Take now a blessing (present) from thy servant.” Or (the) interpretation may be, One shall take to him (a blessing), as (Gen. 43:34), “Messes from before him were taken to them” They who go up into the House of the Lord shall receive a blessing from the Lord, because He will give them His blessing and righteousness, and save them from all trouble, and this is from the God of his salvation.

קח נא את ברכתי, the word ברכתי here means: “my gift.” It occurs in this sense in Kings II 5,15 קח נא ברכה מאת עבדך, “please accept a gift from your servant.”

TAKE, I PRAY THEE, MY BLESSING. I.e., the gift. Likewise, Make your blessing with me⁸⁸II Kings 18:31. means “bring me a gift” or “make your peace with me.” So also, Take a blessing of thy servant⁸⁹Ibid., 5:15. means “take a present from thy servant.” They called a gift which a man sends of his own free will “a blessing” because he sends it from that with which G-d had blessed him, just as the verse states, Wherewith the Eternal thy G-d hath blessed thee thou shalt give unto him,⁹⁰Deuteronomy 15:14. and just as Scripture said above, And he took of that which he had with him.⁹¹Above, 32:14. However, a specific gift of that which has been agreed upon as due the king is called mas (tribute).