Mark 12 :30. 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 Lord Jesus said that this is the most important commandment (Mark 12:29)
The second is this: Love your neighbour as yourself. There is no commandment greater than these. Mark 12:31.
I am the Lord , and there is no other.
Apart from me there is no God.
Isaiah 45:5