en_tn_condensed/psa/039/006.md

Surely every man walks about like a shadow

The lives of people are spoken of as if they are as insignificant as shadows. AT: "Everyone disappears like shadows do" (See: rc://en/ta/man/translate/figs-simile)

although they do not know who will receive them

Here it is implied that they do not know what will happen to their wealth after they die. The full meaning of this statement can be made explicit. (See: rc://en/ta/man/translate/figs-explicit)