Genesis 26:29
That thou wilt do us no hurt, as we have not touched thee, and as we have done unto thee nothing but good, and have sent thee away in peace: thou art now the blessed of the LORD. That thou wilt do us no hurt, as we have not touched thee, and as we have done unto thee nothing but good, and have sent thee away in peace: thou art now the blessed of the LORD.
The words are those spoken by Abimelech, king of Gerar, together with his companions, to Isaac, affirming that Isaac had done them no hurt and nothing but good and had sent them away in peace, and declaring him to be now the blessed of the LORD. His covenant not to do them harm expressed the peace he already sought with all people, and that peaceful conduct was part of his witness to the world.
The saying belongs to Isaac's sojourn in the land of the Philistines in time of famine, where he received abundant blessing and where differences arose between him and the Philistines. It falls within God's providential dealings with Abraham's family, the chosen line through which the Seed would come. In that setting it shows God's special providence over Isaac as one of the progenitors of the promised Seed.
Through those differences Isaac continually yielded more than justice required rather than strive, refusing to contend for his rights and committing his cause to God, and seeking peace with all men. God worked for him in consequence of that course, blessing him and bringing peace between him and the Philistines. His peaceful and beneficial conduct toward his neighbors, together with his prosperity, led them to see that the LORD was with him and had blessed him. His continual willingness to yield rather than strive gave them opportunity to recognize God's presence and blessing, so that his prosperity and godly example made his faith evident to those around him.
Abimelech's coming to seek a covenant and make peace recognized that the LORD was with Isaac, and that peace-making was a further acknowledgment that Isaac's God is greater than the gods of the Philistines. The request itself is evidence that knowledge of the LORD existed among the people of that land. The blessing thus acknowledged confirms to Isaac, the son of promise, the blessing first promised to Abraham that through his seed all nations of the earth would be blessed. That blessing came upon Isaac at least in part in connection with Abraham's obedience to God's laws.