Read what the bible said about Deuteronomy chapter 26 verse 12

This is what the Bible said about Deuteronomy chapter 26 verse 12, here is what is says:
(12) “When you have finished laying aside all the tithe of your increase in the third year—the year of tithing—and have given it to the Levite, the stranger, the fatherless, and the widow, so that they may eat within your gates and be filled,
why is it that most pastors don't preach about Deuteronomy chapter 26 verse 12?
Can i know or get the reason why they don't read that part in the bible??..