Sefer Ha'mitzvos Ha'Katzar (The concise book of mitzvos)
By the Chofetz Chaim
This book lists the Torah mitzvos that can be observed today
First Section – the Positive Commandments
52. It is a positive commandment to give the first wool shearing to the Cohain (priest)
As it states in Devarim (Deuteronomy) 18:4, "The first wool shearings of the sheep shall be given to him." The proper size according to our Sages is one sixtieth. A person is only required to give the shearings from a sheep. Also, the requirement is only if there are at least five sheep that each have a weight of twelve selaim of wool on them, which is 60 selaim for the whole group.
This applies like the Matanos, which was written in Positive Commandment number 51.