Reference for Kiddushin 64:15
ות"ק משום דבעי למיסמך זקן ויראת ותנא קמא מ"ט אי ס"ד כדקאמר רבי יוסי הגלילי א"כ נכתוב רחמנא
What is R'Jose the Galilean's reason? - He can tell you: should you think as the first Tanna asserts, if so, the All-Merciful should have written: 'Thou shalt rise up before the hoary headed zaken and honour [him]'; why did the All-Merciful divide them? To teach that the one [hoary head] is not identical with the other [zaken], and vice versa. This proves that even a young sage [is included]. And the first Tanna?<span class="x" onmousemove="('comment',' How does he explain the dividing up of the verse?');"><sup>31</sup></span> - That is because it is desired to place 'old man' in proximity to 'and thou shalt fear'.<span class="x" onmousemove="('comment',' In accordance with the teaching of R. Simeon b. Eleazar.');"><sup>32</sup></span> Now, what is the first Tanna's reason? - Should you think as R'Jose the Galilean maintains, if so, the All-Merciful should have written,