This may seem unlikely, but the fact is that there is a lack of sound theological studies on mercy in interpersonal relationships in the Old Testament. While the subject of God’s mercy is very popular among theologians and many papers and monographs have been devoted to it, the subject of: ‘mercy in human relations in the Old Testament’ actually appears solely in Biblical dictionaries and encyclopaedias, where it is discussed only in general terms. Therefore works on this subject are exceptional, one of them being that of Father Wojciech Węgrzyniak, available in Polish and entitled Miłosierdzie międzyludzkie w Starym Testamencie (Interpersonal Mercy in the Old Testament); it was written for the Third International Congress of the Apostles of Divine Mercy in Kraków-Lagiewniki in 2008. A part of this study is presented below.