Walk through Amos, verse by verse, with the great Bible Commentaries of Matthew Henry (1662 - 1714) & Adam Clarke (1760 - 1832)
8:14
They that swear by the sin of Samaria, and say, Thy god, O Dan, liveth; and, The manner of Beersheba liveth; even they shall fall, and never rise up again. KJV
{which swear in the trespass of Samaria, and say, Dan, thy god liveth, and the way of Beersheba
liveth; and they shall fall, and they shall no more rise again.} Wycliffe's Bible
The particular destruction of those that were ringleaders in idolatry, Observe, 1. The sin they are charged with: They swear by the sin of Samaria, that is, by the god of Samaria, the idol that was worshipped at Bethel, not far off from Samaria. Thus did they glory in their shame, and swear by them as their god which was their iniquity, thinking that could help them which would certainly ruin them, and giving the highest honour to that which they should have looked upon with the utmost abhorrence and detestation. They say, Thy god, O Dan! liveth; that was the other golden calf, a dumb deaf idol, and yet caressed and complimented as if it had been the living and true God. They say, The manner, or way, of Beer-sheba liveth; they swore by the religion of Beer-sheba, the way and manner of worship used there, which they looked upon as sacred, and therefore swore by and appealed to as a judge of controversy. Thus the papists swear by the mass, as the manner of Beer-sheba. 2. The destruction they are threatened with. Those who thus give that honour to idols which is due to God alone will find that the God they affront is thereby made their enemy,