The men of Shechem set liers in wait - It pleased God to punish this bad man by the very persons who had contributed to his iniquitous elevation. So God often makes the instruments of men's sins the means of their punishment. It is likely that although Abimelech had his chief residence at Shechem, yet he frequently went to Ophrah, the city of his father; his claim to which there was none to oppose, as he had slain all his brethren. It was probably in his passage between those two places that the Shechemites had posted cut-throats, in order to assassinate him; as such men had no moral principle, they robbed and plundered all who came that way.

And the men of Shechem set liers in wait for him in the top of the mountains,.... Of Ebal and Gerizim, which were near Shechem, by the way of which he passed when he came to that city, and these they set there, either to slay him, or to seize his person, and bring him to them:

and they robbed all that came along that way by them; that belonged to Abimelech and others also; and this they did to show their contempt of his government, and that they were no longer under it, and every man did what was right in his own eyes, as if they had no governor over them; though some think this was done to draw him thither to secure his subjects from such rapine and violence, that they might have an opportunity to lay hold upon him, or this they did on purpose to begin a civil war:

and it was told Abimelech; that they lay in wait for him, and so he kept himself from them.

The faithlessness of the Shechemites towards Abimelech commenced by their placing liers in wait for him (לו, dat. incomm., to his disadvantage) upon the tops of the mountains (Ebal and Gerizim, between which Shechem was situated), who plundered every one who passed by them on the road. In what way they did harm to Abimelech by sending out liers in wait to plunder the passers-by, is not very clear from the brevity of the narrative. The general effect may have been, that they brought his government into discredit with the people by organizing a system of robbery and plunder, and thus aroused a spirit of discontent and rebellion. Possibly, however, these highway robbers were to watch for Abimelech himself, if he should come to Shechem, not only to plunder him, but, if possible, to despatch him altogether. This was made known to Abimelech. But before he had put down the brigandage, the treachery broke out into open rebellion.

And the men of Shechem set liers in wait for him in the top of the mountains, and they robbed all that came along that way by them: and it was told Abimelech.

9:25 For him - To seize his person. Robbed all - Such as favoured or served Abimelech; for to such only their commission reached, though it may be, they went beyond their bounds, and robbed all passengers promiscuously.

9:22-29 Abimelech is seated in the throne his father refused. But how long does this glory last? Stay but three years, and see the bramble withered and burned. The prosperity of the wicked is short and fickle. The Shechemites are plagued by no other hand than Abimelech's. They raised him unjustly to the throne; they first feel the weight of his sceptre.