Luke 11:8

importunity--The word is a strong one--"shamelessness"; persisting in the face of all that seemed reasonable, and refusing to take a denial. as many, &c.--His reluctance once overcome, all the claims of friendship and necessity are felt to the full. The sense is obvious: If the churlish and self-indulgent--deaf both to friendship and necessity--can after a positive refusal, be won over, by sheer persistency, to do all that is needed, how much more may the same determined perseverance in prayer be expected to prevail with Him whose very nature is "rich unto all that call upon Him" (Rom 10:12).

In this chapter, I. Christ teaches his disciples to pray, and quickens and encourages them to be frequent, instant, and importunate in prayer (Luk 11:1-13). II. He fully answers the blasphemous imputation of the Pharisees, who charged him with casting out devils by virtue of a compact and confederacy with Beelzebub, the prince of the devils, and shows the absurdity and wickedness of it (Luk 11:14-26). III. He shows the honour of obedient disciples to be greater than that of his own mother (Luk 11:27, Luk 11:28). IV. He upbraids the men of that generation for their infidelity and obstinacy, notwithstanding all the means of conviction offered to them (Luk 11:29-36). V. He severely reproves the Pharisees and consciences of those that submitted to them, and their hating and persecuting those that witnessed against their wickedness (v. 37-54).

11:8 because of your shameless persistence (or in order to avoid shame, or so his reputation won’t be damaged): Shame would also lie on the man who didn’t want to get up, since hospitality was a community requirement. God protects his good name by providing for his people.