Related su Esodo 23:19

Why was it said: [The law concerning the giving of the] firstfruits applies only to the existence of the temple? Because it is said: "You shall bring the first of the fruits of your land into the house of YHVH your God". As long as the temple exists, one must give up the firstfruits; if there is no temple, there is no obligation to give the firstfruits.

The second, precepts received on the authority of Revelation which reason neither obligates nor rejects such as the prohibition of milk with meat, shaatnez (garments woven of wool and flax), kilaim (sowing diverse seeds together), and similar precepts whose reason for being prohibited or obligatory is unknown to us.