MARK 12:18-34

And 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?"

Jesus answered,

"The foremost is, 'Hear, O Israel!
The Lord our God is one Lord;
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.'

"The second is this,
'You shall love thy neighbor as yourself.'

There is no other commandment greater than these."