Musar for Yevamot 157:4

Chazal have said further (Yalkut Tehillim): "Chesed stands up for a man until the end of all the generations, as it is written (Psalms 103.:17): 'And the chesed of the L-rd is from world unto world to those who fear Him, etc.'" And this trait is one of the three goodly traits implanted in Israel — shamefacedness, mercy, and lovingkindness, as Chazal have stated (Yevamoth 79a).

The quality of mercy identifies the descendants of Abraham our father — the seed of Israel as it is written in Deuteronomy 13:18: "And He shall show you mercy and have mercy upon you and multiply you" i.e. (God will give you the quality of mercy). Therefore, everyone should accustom himself to speak all his words with the language of petition and mercy. Also, when he prays, his prayer should be in the tone of plea and petition. And great indeed is the reward that a man will receive from his words of mercy when he speaks to the heart of the poor.

Haman said that Pharaoh's plan had been foolish, since anyone cohabiting with a Jewish woman and siring a child would be siring a Jewish child (It makes no difference whether such a child is considered a ממזר, "bastard" in Jewish law in the sense that he cannot legally marry a Jewish partner). This is the reason he determined to kill all the Jews. By doing so, he would also destroy the third pillar that keeps the universe going, i.e. that keeps its spiritual potential alive. The pillar referred to is גמילות חסדים, the performance of deeds of loving kindness. Once Israel would be wiped out no vestige of חסד love, would remain in this world. Our sages in Yevamot 79 have stated that חסד is one of the three attributes that distinguish members of the Jewish people and make them different from the Gentiles (the others being chastity and pity. The relevant verse is “כי גבר עלינו חסדו”, Psalms 117,2). All the three attributes mentioned are sub categories of חסד.