Mark 12:28-30 (NASB)

²⁸ One of the scribes came and heard them arguing, and recognizing that He had answered them well, asked Him, “What commandment is the foremost of all?” ²⁹ Jesus answered, “The foremost is, ‘Hear, O Israel! The Lord our God is one Lord; ³⁰ and you shall love the Lord your God with all your heart, and with all your soul, and with all your mind, and with all your strength.’