Two

8 There is one alone, and there is not a second; yea, he hath neither child nor brother: yet is there no end of all his labour; neither is his eye satisfied with riches; neither saith he, For whom do I labour, and bereave my soul of good? This is also vanity, yea, it is a sore travail.

9 Two are better than one; because they have a good reward for their labour.

10 For if they fall, the one will lift up his fellow: but woe to him that is alone when he falleth; for he hath not another to help him up.

11 Again, if two lie together, then they have heat: but how can one be warm alone?

12 And if one prevail against him, two shall withstand him; and a threefold cord is not quickly broken…Ecclesiastic 4:8-12

More References: Gen. 1:16; 19:1,8,15,16,30; 22:3; 25:23; 27:36, Ex. 12:7,22,23; 32:15; 34:1,4,29; 37:7-10, Lev. 16:1, Num. 7:89; 9:22; 10:2; 11:26,31; 22:22; 26:10, Deut. 4:13; 5:22; 10:1,3; 17:6, Josh. 2:1,4,10,23; 6:22, Judg. 3:16; 11:37-39; 15:4,13; 16:3,28,29, Ruth 1:1-8,19; 4:11, 1 Sam. 1:2,3; 4:4,11,17; 27:8; 30:5,12,18,21, 2 Sam. 14:26,28, 1 Kin. 3:18,25; 7:15,16,18,20,24,26,41,42; 18:21,23,32; 9:10; 17:12, 2 Kin. 1:14; 2:8; 7:1,14,16,18; 17:16, 1 Chr. 1:19; 4:5; 3:10, 2 Chr. 5:10; 21:19,20; 33:5, Ezra 2:3-7,10,12,14,19,24,27-31,37,38,58; 2:64-66; 6:17, Neh. 5:14; 6:15;7:8,12,17,19,28,31,33,34,40,41,60,62,66,67,68,71,72; 11:12,13,18,19; 22:31,40; 13:6, Esth. 2:21; 6:2; 9:27, Job 42:7; Ps. 149;6, Prov. 5:4; 30:7,15, Eccl. 4:9,11,12, Song. 4:5; 6:13; 7:3; 8:12, Is. 7:4,21; 17:6; 36:8; 47:9; 51:19, Jer. 2:13,14; 28:3,11; 39:4; 52:7,20,29, Ezra 1:11,23; 21:19,21; 32:2; 40:9,39,40; 43:14; 45:15; 46:19; 47:13; 48:17, Dan. 5:31; 8:3,6,7,14,20; 9:25,26; 12:5,11, Hos. 6:2; 10:10, Amos 1:1; 3:3,12; 4:8, Zech. 4:3,11,12,14; 5:9; 6:1; 11:7; 13:8, Matt. 2:16; 4:18,21; 20:21,24,30; 24:40,41; 26:2,37,60; 27:38, Mark 5:13; 6:7,9,37,38,41,43,45,47; 14:1,13; 15:27; 16:12, Luke 2:24; 7:19,41; 10:1,35; 17:34,35,36; 21:2; 24:4,13, John 1:35,37,40; 4:40,43; 8:17; 19:18; 21:2,8, Acts 1:23,24; 9:38; 19:10,22,34; 24:27; 27:27,41; 28:30, 1 Cor. 6:16; 14:27,29, 2 Cor. 13:1, Gal. 4:22,24, Eph. 5:31, Phil. 1:23, 1 Tim. 5:19, Heb. 4:12; 6:18; 10:28, Rev. 1:16; 2:12; 9:12,16; 11:2,3,4,10; 12:6,14; 13:5,11