Do we have to tithe our time as well? Some preachers teach that Tithing does not only mean material things, but it also means giving 10% of your time as well. Some even say 10% of your everything, like your thoughts, your desires, your food, etc.

Is there any ambiguous1 reference from the Bible to support this? When did this teaching evolved? Is there any particular Christian sect who follow this?

It's a good teaching anyway.



1  I can't find any direct reference
The tithe is seen by many to be an Old Testament law for people in the covenant and not binding on New Testament Christians.  That being said, the tithe is also seen as a good principle to start from.

I personally try to give more than 10% and hope to increase the percentage over time.  (However, the government keeps taking more of my money, which makes this more difficult.)   R. G. Letourneau actually gave 90% of his income away to various Christian ministries.

It seems a proper Christian attitude is not to give the bare minimal to the work of Christ and indulge the flesh with the rest of it, but to glorify God with 100% of our income, and to not store up for ourselves treasures on earth (Matthew 6:19-21).

The same principle should be applied to our time as well as our talents, opportunities, relationships, and everything else.  Paul gave us this instruction:


  So, whether you eat or drink, or whatever you do, do all to the glory of God.  1 Corinthians 10:31 ESV


So, "all" is not 10%, but 100%.