A command is a Law. Like in the 10 Commandments (Laws).
Jeremiah 31:33 New King James Version (NKJV)
33 But this
is the covenant that I will make with the house of Israel after those days, says the Lord: I will put My law in their minds, and write it on their [
a]hearts; and I will be their God, and they shall be My people.
Hebrews 10:16 New King James Version (NKJV)
16 “This
is the covenant that I will make with them after those days, says the Lord: I will put My laws into their hearts, and in their minds I will write them,”
These passages, and others, are DESCRIPTIVE. They talk about the NEW heart the Lord gives us with His COMMAND (Law) to love.
I can go to my children and say "I command you to respect me!". But tell me how you can command somebody to love you?
My children love me. NOT because I command them, but because they recognize me as their father, and INTRINSICALLY love me. I can't FORCE them to love me.
That's why it's very important to understand that although all mankind are God's Creation, NOT all mankind are God's children. We become His Children when we are born again, given a NEW heart, as a NEW Creation, with His Law of love written on it. It is now INTRINSIC that we will love Him and other brothers and sisters in Him.
We DON'T PERFORM love. It is a natural byproduct of who we are now. Attempting to perform love as a means to stay saved negates the very act of love Jesus did for us in dying for us, and robs Him of His Glory.