26 And as it was in the days of Noah, so it will be also in the days of the Son of Man: 27 They ate, they drank, they married wives, they were given in marriage, until the day that Noah entered the ark, and the flood came and destroyed them all. 28 Likewise as it was also in the days of Lot: They ate, they drank, they bought, they sold, they planted, they built; 29 but on the day that Lot went out of Sodom it rained fire and brimstone from heaven and destroyed them all. 30 Even so will it be in the day when the Son of Man is revealed (Luke 17:26–30, NKJV).
In this context, the “days of the Son of Man” text points toward the time of God’s judgment against the sinful nation Israel (Luke 17:37; 21:20-22; Matt. 24:28). While Christ’s disciples in Judea would be ready to “flee to the mountains” because of the signs He gave them, most would be unprepared as they went about their daily lives (Matt. 24:15-16). As it was in the Lord’s judgment against Jerusalem, the final “day of the Lord” will be unexpected (1 Thess. 5:1-3; 2 Pet. 3:10). We must prepare for the return of the Lord (Matt. 25:1-13). Judgment comes without warning. “Holy conduct and godliness” describes those who are ready for His return and the judgment that follows (2 Pet. 3:11). Likewise, the gospel call to salvation and holy living prepares us for judgment (Matt. 11:28-30; Heb. 9:27; 2 Cor. 5:10). Are you ready? Judgment comes without warning, and only those who are prepared will be saved. “Watch therefore, for you know neither the day nor the hour in which the Son of Man is coming” (Matt. 25:13).