Charles H. Spurgeon on Psalms 99:8

Thou answeredst them, 0 LORD our God. A sweet title and a cheering fact. Our covenant God in a very special manner heard his three servants when they pleaded for the people. Thou wast a God that forgavest them, though thou tookest vengeance of their inventions. He forgave the sinners, but he slew their sins. Some apply this verse to Moses, Aaron, and Samuel, and remind us that each of these fell into a fault and received chastisement. Of Samuel they assert that, for having set up his sons as his successors, he was compelled to submit to the anointing of Saul as king, which was a great grief to him: this is to our mind a very doubtful statement, and leads us to abandon the interpretation altogether. We believe that the passage refers to the nation which was spared through the intercession of these three holy men, but yet was severely chastened for its transgressions. In answer to the cry of Moses the tribes lived on, but the then existing generation could not enter Canaan: Aaron's golden calf was broken, though the fire of the Lord did not consume the people; and Israel smarted under the harsh government of Saul, though at Samuel's request its murmurings against the theocratic rule of their fathers' God was not visited with pestilence or famine. So to forgive sin as at the same time to express abhorrence of it, is the peculiar glory of God, and is best seen in the atonement of our Lord Jesus. Reader, are you a believer? Then your sin is forgiven you; but so surely as you are a child of God the rod of paternal discipline will be laid upon you if your walk be not close with God. "You only have I known of all the nations of the earth, therefore I will punish you for your iniquities."