Mark 12:29 NIV

Deuteronomy 6:4 NIV
Hear, O Israel: The Lord our God, the Lord is one.

Galatians 3:20 NIV
A mediator, however, implies more than one party; but God is one.

Luke 10:27 NIV
He answered, “‘Love the Lord your God with all your heart and with all your soul and with all your strength and with all your mind’ ; and, ‘Love your neighbor as yourself.’ ”