Serving God by serving people

Isaiah 58:1-14
What is the fast be called and accepted to the Lord?
Loose the chains of injustice and untie the cords of the yoke, share your food with the hungry and to provide the poor wandered with shelter.
If you spend yourselves in behalf of the hungry and satisfy the needs of the oppressed, then your light will rise in the darkness, and your night will become like the noonday. If you keep you feet from breaking the Sabbath and from doing as you please on my holy day, you will find your joy in the Lord, and God will cause you to ride on the heights of the land.
Why?
We do our best to express our heart to honor God, by fasting, attending worship, reading God's word, but the Lord more concern out behavior to the poor oppressed and needed people. How about our relationship with others?
Serving God by serving peope.
This makes a mockery of their religious observance (including rigorous fasting): they neither love God nor their fellow human beings.
How?
Serving people does not give from my interest but from the love of the Lord.