Reference for Psalms 106:38

וַיִּֽשְׁפְּכ֨וּ דָ֪ם נָקִ֡י דַּם־בְּנֵ֘יהֶ֤ם וּֽבְנוֹתֵיהֶ֗ם אֲשֶׁ֣ר זִ֭בְּחוּ לַעֲצַבֵּ֣י כְנָ֑עַן וַתֶּחֱנַ֥ף הָ֝אָ֗רֶץ בַּדָּמִֽים׃

And shed innocent blood, even the blood of their sons and of their daughters, Whom they sacrificed unto the idols of Canaan; And the land was polluted with blood.

ספר השרשים