פּירוש אויף בראשית 49:18

'לישועתך קויתי ה I HOPE FOR THY AID, O ETERNAL — He prophesied that the Philistines would put out his (Samson’s) eyes, and that he would have to say (Judges 16:28) “Remember me, I pray Thee, and strengthen me, I pray Thee, only this once etc.”

לישועתך קויתי ה, “I have always hoped for Your salvation, Hashem” Yaakov addresses the tribe of Dan when saying this; in other words: Yaakov prayed that Dan will be successful in his defense of the Jewish people. An alternate explanation: “I have hoped to G-d that your (Dan’s) efforts at saving his people will succeed.” (as predicted by the angel who told the wife on Manoach of the forthcoming birth of Samson, and that he would be the first to save the people from the Philistines. (Judges 13,5)

'לישועתך קויתי ה, “I hope for Your salvation Hashem!” When Yaakov in his prophetic vision of future events saw Shimshon the mighty warrior and what he accomplished, he felt forced to exclaim that Israel’s future would not be in the hands of human warriors but would be secured only by Hashem. In the Book of Judges 15,16, where Shimshon is related as having killed one thousand Philistines with the bone of a donkey as his only weapon, that immediately afterwards he threw that bone to the ground and acknowledged G–d as the source of his success. (verse 18 there). This is also hinted at in his blessing of Dan where the point is made that though Dan will be successful in attacking his adversaries like a snake lying in ambush, he will do so confident of G–d’s salvation.