Ecclesiastes 4:11

⁹ Two are better than one, because they have a good return for their labor.

¹⁰ For if one falls down, his companion can lift him up; but pity the one who falls without another to help him up!

Again, if two lie down together, they will keep warm; but how can one keep warm alone?

¹² And though one may be overpowered, two can resist. Moreover, a cord of three strands is not quickly broken.

¹³ Better is a poor but wise youth than an old but foolish king who no longer knows how to take a warning.

Do read the surrounding verses too, because the context often says more than a single verse.

Compare

BSB: Again, if two lie down together, they will keep warm; but how can one keep warm alone?
KJV: Again, if two lie together, then they have heat: but how can one be warm alone?
WEB: Again, if two lie together, then they have warmth; but how can one keep warm alone?
ASV: Again, if two lie together, then they have warmth; but how can one be warm [alone]?
DARBY: Again, if two lie together, then they have warmth; but how can one alone be warm?
BLB: Also, if two lie down, then there is warmth for them; but for one, how can he keep warm?

ÅB: Likeledes når to ligger sammen, så blir de varme; men hvordan kan den som ligger alene, bli varm?
OTB: Dessuten, hvis to ligger sammen, vil de holde seg varme. Men hvordan kan én holde seg varm alene?
B1930: Likeledes når to ligger sammen, så blir de varme; men hvorledes kan den som ligger alene, bli varm?

1 Kings 1:1–4
Now King David was old and well along in years, and though they covered him with blankets, he could not keep warm.
Read in context