THANKSGIVING

It is good to give thanks unto the Lord whole hearted for the much he has done and go's marvelous deeds.

Giving God thanks is for what he has done.
There is a blessing after giving offering and tithing but for thanksgiving there is no strings attached.
First harvest offering shows that one has no need of the much food.

Psalms:9.1
For the director of music. To [the tune of] "The Death of the Son." A psalm of David. I will praise you, O LORD, with all my heart; I will tell of all your wonders.
Psalms:9.2
I will be glad and rejoice in you; I will sing praise to your name, O Most High.
Psalms:9.3
My enemies turn back; they stumble and perish before you.

There is a life that a person  can live and prevent one from doing the works of the Lord.

Psalms:103.1
Of David. Praise the LORD, O my soul; all my inmost being, praise his holy name.
Psalms:103.2
Praise the LORD, O my soul, and forget not all his benefits--
Psalms:103.3
who forgives all your sins and heals all your diseases,
Psalms:103.4
who redeems your life from the pit and crowns you with love and compassion,
Psalms:103.5
who satisfies your desires with good things so that your youth is renewed like the eagle's.

We have every reason to thank the Lord.