Reference for Menachot 63:2

ואמר רב חננאל אמר רב הלכה כר"ש בן אלעזר מאי לאו אפתוחות

And he answered, Because [the portions] are not close to each other in the Torah.<span class="x" onmousemove="('comment',' The two passages of the mezuzah are not consecutive in the Torah, the one comes from Deut. VI, 4-9 and the other from XI, 13-21. The second passage is therefore to be begun on a separate line.');">²</span> And R'Hananel said in the name of Rab that the halachah follows R'Simeon B'Eleazar.

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