We could even say that when Abraham gave Melchizedek a tenth of everything, Levi was giving a tenth of everything. Levi gave, although later his descendants would receive a tenth of everything.
Every third year is the year when you will store a tenth of that year’s crops ⌞in your houses⌟. During that year distribute what you have stored to the Levites, foreigners, orphans, and widows in your cities, and they may eat all they want.