Hebrews 13:1-2 Let brotherly love continue. Be not forgetful to entertain strangers: for thereby some have entertained angels unawares. 

‘Let brotherly love continue.’ Thirteen commands for Christians: Let brotherly love continue (13:1). Remember those in bonds (13:3). Remember the suffering. Be without covetousness. Be content in life. Remember your leaders (13:7). Be not changeable from sound doctrine (13:9). Follow Christ’s example (13:13). Offer a sacrifice of praise (13:15). Forget not to do good (13:16). Forget not to communicate. Yield to your leaders (13:17). Greet [be friendly] your leaders (13:24).

‘Some have entertained angels unawares.’ Appearances of angels to men: Scripture records at least 104 appearances of angels to human beings. They have appeared to: Hagar (2 times, Gen. 16:7-11; 21:17) and Abraham (3 times, Gen. 18:2; 22:11, 15). Lot and Sodomites (Gen. 19:1-22). Jacob (3 times, Gen. 28:12; 31:11; 32:1). Moses (Ex. 3:2). Balaam (Num. 22:22-35). Joshua (Heb. 5:1-14; Ex. 23:20-23; 32:34). Israel (Jdg. 2:1-5). Gideon (Jdg. 6:11-22). Manoah’s wife (Jdg. 13:3-5). Manoah and his wife (Jdg. 13:9-21). David (2Sam. 24:1-25; 1Chron. 21:1-30). Elijah (4 times, 1Kin. 19:5-7; 2Kin. 1:3, 15). Elisha and servant (2Kin. 6:16-17). Assyrians (2Kin. 19:35; Isa. 37:36). Hebrew children (Dan. 3:25-28). Nebuchadnezzar (Dan. 3:24-25). Daniel (5 times, Heb. 6:1-20; Dan. 8:16; 9:21; 10:5-21; 12:5-7). Zechariah (7 times, Heb. 1:8-19; Zech. 2:3; 3:1-6; 4:1-5; 5:5-10; 6:4-5; 12:8). Joseph (3 times, Matt. 1:20; 2:13, 19). Mary (Luke 1:26-38). Zacharias (Luke 1:20-38). Shepherds (Luke 2:9-14). Jesus (2 times, Matt. 4:11; Luke 22:43). Some women (Matt. 28:1-5). The disciples (Acts 1:11). Peter and John (Acts 5:19). Philip (Acts 8:26). Cornelius (Acts 10:3, 30-32). Peter (Acts 12:7-11). Paul (Acts 27:23). John (52 angels in Revelation).