Halakhah for I Samuel 3:23

The commandment is practiced by priests at the time of the Temple, as the commandment to blow the trumpets is incumbent upon them, and like the matter that is written about them in the movements of the encampments (Numbers 10:8), "And the sons of Aharon, the priests, will blow with the trumpets." And lest you say that they did not blow over the sacrifices, but rather the Levites, this is not so. As behold, they explicitly said (Mishnah Tamid 7:3), "They gave him the wine to pour [for the libation]. The assistant stood on the horn [of the altar] with two handkerchiefs in his hand. Two priests stood in the table of (used for) fats and two trumpets were in their hands. They blew a teki'ah (long steady sound), then a teruah (a series of very short sounds) and then again a teki'ah." Behold, it is elucidated that this commandment was performed by the priests, and that it was a constant commandment to them, meaning to say that they would blow every day, and not only on a holiday or the day of the new month. However, I have seen that Rambam wrote (Mishnah Torah, Vessels of the Sanctuary and Those who Serve Therein 3:5), "On all the festivals and on the the new moon days, the priests would sound the trumpets and the Levites would sing." It seems from his words that his opinion is that on other days, even the Levites blow the trumpets. And if the priests transgressed this and did not blow at the time of a sacrifice, and so [too,] if they did not blow at a time of trouble, they will have nullified this positive commandment.