In poetry, what is the terminology for major/key stanzas that are a basis for some of the subsequent stanzas?
(New American Standard Bible 1995)
1 Hear, O sons, the instruction of a father,
And give attention that you may [a]gain understanding,
12 When you walk, your steps will not be impeded;
And if you run, you will not stumble.
13 Take hold of instruction; do not let go.
Guard her, for she is your life
14 Do not enter the path of the wicked
And do not proceed in the way of evil men.
15 Avoid it, do not pass by it;
Turn away from it and pass on.
16 For they cannot sleep unless they do evil;
And [e]they are robbed of sleep unless they make someone stumble.
17 For they eat the bread of wickedness
And drink the wine of violence.
18 But the path of the righteous is like the light of dawn,
That shines brighter and brighter until the full day.
19 The way of the wicked is like darkness;
They do not know over what they [f]stumble.
20 My son, give attention to my words;
Incline your ear to my sayings.
21 Do not let them depart from your sight;
Keep them in the midst of your heart.
22 For they are life to those who find them
And health to all [g]their body.
23 Watch over your heart with all diligence,
For from it flow the springs of life.
To elaborate by example, in Proverbs 4 of the Bible, the Proverbs 4:14 stanza verse is the major/key stanza because it sets the key "instructive" emphasis on Not being wicked and Not being evil, and the subsequent stanzas are supplementary/supportive to the Proverbs 4:14 stanza verse, Proverbs 4:15 to Proverbs 4:19.
Furthermore, Proverbs 4:20 stanza verse is another example of a major/key stanza because the following Proverbs 4:21 to Proverbs 4:27 stanza verses are supplementary/supportive to the Proverb 4:20 stanza verse.
In poetic literature, what is the term given to major/key stanzas like Proverbs 4:14 and Proverbs 4:20 stanza verses?