Tosefta for Chagigah 11:13
ודקאמרת נילף מנשיאים דנין דבר הנוהג לדורות מדבר הנוהג לדורות ואין דנין דבר הנוהג לדורות מדבר שאינו נוהג לדורות
And for that which you are saying, that we should learn from "the princes," we can compare something that will always apply to a thing that will always apply, and we can not compare a thing which will always apply to a thing which will not always apply.
Tosefta Chagigah
Yochanan ben Dahavei says in the name of Rabbi Yehuda, Neither is a blind man [obligated to appear at the Temple on the Festivals], as it says (Ex. 23:17), "[All of your males] shall be seen," this excludes the blind. Rebbi answered the words of Yochanan ben Dahavei: The Sages decided to support the opinion of (סִיעַ) Rabbi Yehuda [in reliance upon] (1 Sam. 1:22), "Hannah did not ascend, because she said to her husband, 'When the child is weaned, [I will bring him, that he may appear before the Lord]." [Just as a minor is not obligated until he can ascend independently, so too a blind person, who requires support to ascend the Temple, is not obligated to appear (see Chag. 6a:3).]
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