Related for Taanit 54:13
ושמואל אמר פוסק מ"ט לא אמר דולג גזירה משום הנכנסין וגזירה משום היוצאין
It has been taught: Two persons read [the section] 'In the beginning', and one 'Let there be a firmament'. I can understand one person reading, 'Let there be a firmament', as it contains three verses, but how can two persons read, 'In the beginning', seeing that it contains only five verses?
Tosefta Megillah
We do not read fewer than three verses from the Torah at one time. If there was a section with four [verses] or of five [verses] (i.e., which cannot be divided into two or more sections of three), behold, one person reads the whole thing. [If] there was a section of five and he read three and left out the other two, the one who stands up to read after him reads those two and another three from a different section. If there was a section of four or five [verses], behold, he reads everything. We may not read an additional [portion from the] Prophets (i.e., the haftarah) of less than three verses at one time. If there was a section of four or five verses, behold, he reads everything. One who cuts short [the reading], behold he is praised. If it was a short section, such as (Is. 42:3), "For thus says the Lord, you were sold for nothing, and you shall be redeemed without money," it is read by itself.
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