Seriously, every reading has at least one citation. Every reading. Even both the semicontinuous readings. Is this another instance of a Lutheran applying some influence on the Revised Common Lectionary selections? Or maybe just a Phillipist, given all the citations from the Apology.

Genesis 15:1-6

After these things the word of the Lord came to Abram in a vision, “Do not be afraid, Abram, I am your shield; your reward shall be very great.”
— Genesis 15:1 (NRSVue)

Verse 1 is quoted in Apology of the Augsburg Confession, Article 4: Justification (AP 4.58) as an example of someone, Abraham in this case, hearing and believing God's promise.

And he believed the Lord, and the Lord reckoned it to him as righteousness.
— Genesis 15:6 (NRSVue)

Verse 6 is cited in Formula of Concord, Solid Declaration, Article 3: Righteousness (FC, SD 3.33), along with Hebrews 11:8 below, to show that God declares Abram righteous both before Abram does any good works and also after Abram does a good work, emphasizing that the good works did not change God's judgment.

Verse 6 is also cited in a footnote a bit later in the same article (FC, SD 3.41, n. 119) indicating where Luther's summary of this verse and story might be found.

Isaiah 1:1, 10-20 (Semicontinuous)

Wash yourselves; make yourselves clean;
remove your evil deeds
from before my eyes;
cease to do evil;
learn to do good;
seek justice;
rescue the oppressed;
defend the orphan;
plead for the widow.
Come now, let us argue it out,
says the Lord:
If your sins are like scarlet,
will they become like snow?
If they are red like crimson,
will they become like wool?
If you are willing and obedient,
you shall eat the good of the land…
— Isaiah 1:16-19 (NRSVue)

Verses 16 thru 19 are partly quoted in Apology of the Augsburg Confession, Article 12: Repentance (AP 12.164) to show that repentance positively effects both our public and private lives.

If you are willing and obedient,
you shall eat the good of the land,
but if you refuse and rebel,
you shall be devoured by the sword,
for the mouth of the Lord has spoken.
— Isaiah 1:19-20 (NRSVue)

Verses 19 thru 20 are cited with several other passages in a footnote to Apology of the Augsburg Confession, Article 18: Free Will (AP 18.1, n. 415) that come from the Confutation, and that Melanchthon notes about the line from the Confutation "are not at all applicable to this matter [of free will]" (AP 18.1). Ha!

Psalm 33:12-22

Truly the eye of the Lord is on those who fear him,
on those who hope in his steadfast love,
— Psalm 33:18 (NRSVue)

Verse 18 is quoted within a quote from a sermon from Bernard of Clairvaux in Apology of the Augsburg Confession, Article 12: Repentance (AP 12.58 octavo, Bernard's Sermon on the Annunciation of the Blessed Virgin Mary) to show Bernard connecting contrition and faith through this psalm verse. This Psalm pericope is also used for the Vigil of Pentecost.

Psalm 50:1-8, 22-23 (Semicontinuous)

Not for your sacrifices do I rebuke you;
your burnt offerings are continually before me.
— Psalm 50:8 (NRSVue)

Verse 8 is quoted in Apology of the Augsburg Confession, Article 4: Justification (AP 4.207) as one of the prophets' rebukes against an ex opere operato understanding of religious rituals, assuming that they give us some control over God.

Hebrews 11:1-3, 8-16

Now faith is the assurance of things hoped for, the conviction of things not seen.
— Hebrews 11:1 (NRSVue)

Verse 1 is cited in The Augsburg Confession, Article 20: Faith (AC 20.25, German text only) as evidence that faith is not simply knowledge, but trust in God to keep promises.

By faith Abraham obeyed when he was called to set out for a place that he was to receive as an inheritance, and he set out, not knowing where he was going.
— Hebrews 11:8 (NRSVue)

Verse 8 is cited in Formula of Concord, Solid Declaration, Article 3: Righteousness (FC, SD 3.33) with Genesis 15:6 above, to show that God declares Abraham righteous both before Abraham does any good works and also after, emphasizing that the good works did not change God's judgment.

Luke 12: 32-40

Sell your possessions and give alms. Make purses for yourselves that do not wear out, an unfailing treasure in heaven, where no thief comes near and no moth destroys.
— Luke 12:33 (NRSVue)

Verse 33 is cited in a footnote to The Large Catechism, Part 1: The Ten Commandments, The Seventh Commandment (LC 1.242, n. 106) as a reference along with Matthew 6:19-20 for one of Luther's biblically inspired curses: "Yes, where you have cheated and defrauded anyone out of a gulden [a dollar], your entire hoard ought to be consumed by rust so that you will never enjoy it" (LC 1.242).

TheoThru

At least one connection between the texts is directly made for us in the Formula, but the connection here seems direct: faith is trusting that God will keep the promises God has made. The challenge still present is to not think that our work, be it our doing good works, our participation in rituals, or even our trusting God, give us some kind of power or authority over God's judgment.

How do we lead worship so that people don't think of it as magic?
How is God calling us as preachers to more deeply trust God's promises?