Reference for Yoma 107:12

מתיב רב חסדא (במדבר ד, כ) ולא יבואו לראות כבלע את הקדש ואמר רב יהודה אמר רב בשעת הכנסת כלים לנרתק שלהם

- how is that possible? - They could be observed, but not actually seen. Thus was it also taught: 'And the ends of the staves were seen One might have assumed that they did not protrude from their place. To teach us [the fact] Scripture says: 'And the staves were so long'.

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