What Does Deuteronomy 4:40 Mean?
Guard therefore his statutes and his commandments, which I command you this day, that it may go well with you, and with your children after you, and that you may prolong your days upon the earth, which the LORD your God gives you for the ages.
Key words are shown with the Hebrew or Greek and what each word meant.
Selah Decoded Version The Selah Decoded Version renders what the Hebrew and Greek words meant to the people who first heard them.
King James wording
King James Version
Thou shalt keep therefore his statutes, and his commandments, which I command thee this day, that it may go well with thee, and with thy children after thee, and that thou mayest prolong thy days upon the earth, which the LORD thy God giveth thee, for ever.THE KEY
The hidden force of “keep” is guard: what is guarded becomes a living inheritance, carrying wellbeing through your children and across your days.
THE MEANING
The verse speaks of guarding instruction in the present, with its consequences reaching your children and the length of your life. The earth beneath you is given, and the days lived upon it are described as capable of being lengthened; the promise joins daily life, descendants, and the ground itself.
WHAT THIS UNDOES
It undoes the belief that keeping instruction only restricts life: here, guarded instruction is bound to wellbeing, continuity through children, and length of days.
THE ROOT
וְשָׁמַרְתָּ
vəšāmartā
GROWS FROM
שׁמר
To guard, watch over, keep, or preserve.
“guard” in this verse is vəšāmartā. The word translated “keep” carries the sense of guarding and watching over. The verse presents instruction as an entrusted charge whose keeping protects a way of life that reaches beyond you.
ALSO GROWS
shōmēr: Watchman; one who watches or guards.
שֹׁמֵר
This branch makes the active sense of “keep” visible: it is attentive guarding, not simply holding something in memory.
mishmeret: Guard duty, charge, or watch.
מִשְׁמֶרֶת
The same root can name an entrusted charge, linking the guarded instruction here with a responsibility held over time.
תַּאֲרִיךְ
taʾărîkh
GROWS FROM
ארך
To be long or to lengthen.
“prolong” in this verse is taʾărîkh. The Hebrew verb carries the concrete sense of lengthening days. The same root appears in אֶרֶךְ אַפַּיִם (ʾerekh appayim), “slow to flare,” extending the idea of length from a span of life to a delayed response.
ALSO GROWS
ʾōrekh: Length.
אֹרֶךְ
This noun makes clear that the verse speaks of days being given length.
ʾerekh appayim: Slow to flare; literally, “long of nostrils.”
אֶרֶךְ אַפַּיִם
The shared root carries the sense of extension over time, here describing a response that is slow to rise.
THE PATTERN
Guarded instruction bears on wellbeing and the length of life, reaching beyond the one who keeps it.
My son, do not let my instruction slip from you, and let your heart guard my commands. For length of days, and years of life, and wholeness, they add to you.Give weight to your father and your mother, which is the first commandment with promise. That it may go well with you, and you may be long in days upon the earth.THE THREAD
The LORD watches over you from all harm; he watches over your living soul. The LORD watches over your going out and your coming in, from now and to the ages.Psalm 121 uses the same Hebrew root, שׁמר (shamar), rendered there as “preserve.” The root joins your guarding of instruction with the LORD’s guarding of your life, including your going out and coming in.
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