Theophylact of Bulgaria
From this, we discern that the arrival of the Lord will occur abruptly and without warning. The illustration of two people sharing a bed reflects the negligence of humanity. Similarly, the act of threshing conveys the swiftness of His coming. We also understand that this arrival will take place during the night. Thus, the Lord indicates that among the wealthy who recline in their beds, some will be redeemed while others will not. He previously noted that it is difficult for the rich to find salvation (Matt. 19:23-24). Now, He reveals that not all wealthy individuals are doomed, nor are all impoverished granted salvation; even among the affluent, one will be lifted up and caught away to the Lord (1 Thess. 4:17), embodying a spirit of light and heavenly grace, while the other remains below, facing condemnation.