The blessing of help and protection is here stressed. The same truth is expressed in our aphorism, “in union there is strength.”
Threefold cord.
Separately, three pieces of string may be broken with ease, but when twisted into one cord, they cannot be broken so readily.
Some commentators have gone to unwarranted lengths in an exposition of this verse, professing to see here an allusion to the Trinity. They quote such incidents as the love and companionship between Lazarus and his two sisters, Mary and Martha, and Christ choosing three disciples to accompany Him to the Garden of Gethsemane. Such fanciful exegesis should be avoided.