There are many reasons that Macbeth reviews in his mind and in discussion with Lady Macbeth as to why he should give up the plan to kill Duncan. As has been mentioned, these include the personal excellence of Duncan, Duncan's trust in him, and Duncan's position at the moment as a guest in Macbeth's castle. However, the most important reason -- even more important than the prospect of eternal damnation for such a murder -- is given by Macbeth in Act I, Scene 7:
But in these cases
We still have judgement here, that we but teach
Bloody instructions, which being taught return
To plague the inventor. This even-handed justice
Commends the ingredients of our poison'd chalice
To our own lips.
In other words, if Macbeth murders Duncan, he establishes a precedent that will come back to haunt him: his deed will "plague the inventor." How can he ask anyone to be loyal to him if he has gained the throne by disloyalty and so "taught" the "bloody instructions" that a superior is to be stabbed in the back whenever it is convenient? The details of how he would fail his trust -- turning on a superior, harming a guest -- are less important than the fatal example he would give by betraying trust in any way at all.
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