Psalms 127:1

1If the Lord does not build a house,
The expression build a house may have a double meaning here. It may refer on the surface level to a literal physical structure in which a family lives, but at a deeper, metaphorical level it refers to building, perpetuating, and maintaining a family line. See Deut 25:9; Ruth 4:11; 1 Sam 2:35; 2 Sam 7:27; 1 Kgs 11:38; 1 Chr 17:10, 25. Having a family line provided security in ancient Israel.

then those who build it work in vain.
If the Lord does not guard a city,
The city symbolizes community security, which is the necessary framework for family security.

then the watchman stands guard in vain.
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