Halakhah su Geremia 48:78

It is taught in a baraita (Eruvin 13a): Rabbi Meir said, when I came to Rabbi Ishmael, he said to me “My son, what is your trade?” I said to him “I am a scribe.” He said to me “My son, be meticulous in your work, for it is the work of heaven, and if you should omit a single letter or add a single letter, you destroy the entire world.” From this we may see that a scribe must be in extreme awe of God, for if he makes one error or fails to make one necessary correction, his soul will perish, because he steals from the masses and causes them to sin – they remain in a state of not performing commandments, and every day make blessings in vain. Of him it is written “One sinner destroys much good” (Kohelet 9:18), and “Cursed is he who does God’s work deceitfully” (Jeremiah 48:10). Therefore, those who have the power to appoint scribes should appoint worthy scribes, men of truth who hate bribes and know Torah, fear God and tremble at his words, just as we appoint kosher butchers. All who write tefillin as good and fit as they possibly can will have their reward doubled and doubled again, and will be saved from the judgement of Gehinnom. (From the laws of writing tefillin by R’ Avraham Mazinsheim and in the Levush.)

The laws of the commandment - for example, that which they, may their memory be blessed, said (Mishneh Torah, Laws of Kings and Wars 7:15) that a man not think at the time of war about his wife, nor his children nor his money, but rather he clear his [mind] from everything, to [focus on] the war. And he should further think that all the blood of Israel is dependent upon him, and [so] if he is afraid and 'he pulls back his right [hand],' it is as if he spilled the blood of all of them - and like the matter that is written (Deuteronomy 20:8), "and that the heart of his brothers not melt like his heart." And it is explicit in the words of the tradition, "Cursed be he who makes the Lord’s work a fraud; cursed be he who withholds his sword from blood" (Jeremiah 48:10). And [also] that which they, may their memory be blessed, said (Mishneh Torah, Laws of Kings and Wars 7:15) that anyone who fights with all of his heart and intention to sanctify God is assured that he will not find injury; and it will be a merit for him and his children, that his house will be established in Israel, and he will merit life in the world to come. And [it is] like the matter that is written (I Samuel 25:28), "for the Lord will surely make a faithful house for my master, since my master fights the wars of the Lord, etc." And the rest of the details of the commandment are in the eighth chapter of Sotah (see Mishneh Torah, Laws of Kings and Wars 6).