And they are singing a shir chadash, saying, "Worthy art thou  to take the sefer and to open the chotamot of it, because you were slain and with your dahm [kapparah] you paid the price for the Geulah [Vayikra 25:50-51] redemption and purchased ones for Hashem from every mishpochah  family  and lashon  tongue  and am  people  and goy  nation , [Tehillim 40:3; 98:1; 149:1;  Yeshayah 42:10]