Andtheytooktheirdaughters - They formed matrimonial alliances with those proscribed nations, served their idols, and thus became one with them in politics and religion.
As the Israelites were a type of the church on earth, they were not to be idle and slothful. The Lord was pleased to try them by the remains of the devoted nations they spared. Temptations and trials detect the wickedness of the hearts of sinners; and strengthen he graces of believers in their daily conflict with Satan, sin, and this evil world. They must live in this world, but they are not of it, and are forbidden to conform to it. This marks the difference between the followers of Christ and mere professors. The friendship of the world is more fatal than its enmity; the latter can only kill the body, but the former murders many precious souls.
SDA Bible Commentary (limited)
Volume 1-7
6. Took their daughters. Intermarriage between those who honored God and those who did not is mentioned in the book of Genesis as one factor that accounts for the wickedness that prevailed on the earth prior to the Flood (Gen.6:2-4). Yahweh had strictly forbidden intermarriage with the unbelieving nations of Canaan (Deut. 7:3), but the people often ignored this precept. The results of such intermarriage are evident from Solomon’s experience (1 Kings 11:1-8). The danger of similar tragic results exists today. Too often the marriage of a believer and unbeliever corrupts the faith of the believing party. It could hardly be otherwise (see 2 Cor. 6:14-17).