Genesis 31

Genesis 22:17:
That in blessing I will bless thee, and in multiplying I will multiply thy seed as the stars of the heaven, and as the sand which is upon the sea shore; and thy seed shall possess the gate of his enemies; 

​This prediction appears in the Lord's word of promise to Abraham in response to his faith and obedience in being willing to follow the Lord's command to sacrifice his only son, Isaac. In context, this prophecy is part of the comprehensive plan for the seed of Abraham: Abraham's seed shall multiply and be as the stars of heaven in number; Abraham's seed will be the means of blessing to all nations of the earth.
The Hebrew word for "possess" (yarash) means to take, to take possession of, to inherit, dispossess, or to occupy. The word was commonly used in reference to Israel's possession of the land of Canaan by conquering the inhabitants and occupying their land (Dt 31:3). The specific object to be possessed in this prediction is the gate of their enemies. The word "gate" is filled with significance in the Old Testament. The gate was important for war, commerce, and civil government. In war, if one could penetrate the gates of a city, his victory was virtually assured; control of the gates determined the outcome of the conflict. In commerce, those who controlled the gates determined who could and who could not enter the city to do business. In civil government, the gate was the place where the elders and rulers of the people would sit to hold court and carry out the other aspects of civil ruling. Therefore, to "possess" the gate" of your enemy is to conquer him and take control of his city, commerce, and civil government. In the New Testament perspective, it promises the church complete dominion over the heathen and possession of all the nations of the earth, i.e., all nations will be conquered by the gospel of Christ and be discipled in the Christian faith. Believers in Jesus Christ will dispossess the enemies of God and control the "gate" in all nations.