Reference for Kiddushin 66:13

ר' אלעי ור' יעקב בר זבדי הוו יתבי חליף ואזיל ר' שמעון בר אבא וקמו מקמיה אמר להו חדא דאתון חכימי ואנא חבר ועוד כלום תורה עומדת מפני לומדיה

He meant thus: As for me, it is not meet that I should stand up before my son, even if he were my teacher, seeing that I am his father, but that the honour of the Nasi's house [demands it]. The scholars propounded: Is riding the same as walking,<span class="x" onmousemove="('comment',' So that disciples must rise before their teacher when he rides past.');">¹⁵</span>

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