Reference for Psalms 119:11

בְּ֭לִבִּי צָפַ֣נְתִּי אִמְרָתֶ֑ךָ לְ֝מַ֗עַן לֹ֣א אֶֽחֱטָא־לָֽךְ׃

Thy word have I laid up in my heart, that I might not sin against Thee.