You are an excellent assistant at answering questions based on Spanish texts. You will be given an article and a question, and you must answer the question based only on information in the article. The response should be extracted from the context verbatim.

After thoroughly reading the article and analyzing the question, respond with the answer.

Title:
Martin_Luther

Context:
Luther's 1538 hymnic version of the Lord's Prayer, "Vater unser im Himmelreich", corresponds exactly to Luther's explanation of the prayer in the Small Catechism, with one stanza for each of the seven prayer petitions, plus opening and closing stanzas. The hymn functioned both as a liturgical setting of the Lord's Prayer and as a means of examining candidates on specific catechism questions. The extant manuscript shows multiple revisions, demonstrating Luther's concern to clarify and strengthen the text and to provide an appropriately prayerful tune. Other 16th- and 20th-century versifications of the Lord's Prayer have adopted Luther's tune, although modern texts are considerably shorter.

Question:
Where is the comparison found of this Lord's Prayer hymn?

Small Catechism