DEUT1724 We must be merciful toward others to deserve mercy from God. The Torah is referring to the Bais Hamikdosh which was in the portion of Binyamin. (Rashi). The Midrash states that the Bais Hamikdosh was in the portion of Binyamin rather than in the portion of any other tribe because the other brothers took part in the sale of Yosef. Binyamin was the only brother who was free from guilt. Since the function of the Bais Hamikdosh was to serve as a place where people could pray to God for mercy, God did not want His abode to be in the portion of those who are themselves were not merciful. (Yalkut Shimoni)