II Chronicles 15:12 Midrash

וַיָּבֹ֣אוּ בַבְּרִ֔ית לִדְר֕וֹשׁ אֶת־יְהוָ֖ה אֱלֹהֵ֣י אֲבוֹתֵיהֶ֑ם בְּכָל־לְבָבָ֖ם וּבְכָל־נַפְשָֽׁם׃

And they entered into the covenant to seek the LORD, the God of their fathers, with all their heart and with all their soul;