Siman 138
Presented here for study, not as a practical ruling. The Shulchan Aruch rules by Sephardi custom, the Rema's glosses by Ashkenazi custom, and the Kitzur follows Ashkenazi custom. For a practical question, ask your rabbi.
א הַקּוֹרֵא בַּתּוֹרָה לֹא יְשַׁיֵּר בְּפָרָשָׁה פָּחוֹת מִג' פְּסוּקִים, מִפְּנֵי הַיּוֹצְאִים אָז מִבֵּית הַכְּנֶסֶת שֶׁיֹּאמְרוּ: הָעוֹלֶה אַחֲרָיו לֹא יִקְרָא אֶלָּא שְׁנֵי פְּסוּקִים הַנִּשְׁאָרִים; וְכֵן לֹא יַתְחִיל בָּהּ פָּחוֹת מִג' פְּסוּקִים, מִפְּנֵי הַנִּכְנָסִים אָז בְּבֵית הַכְּנֶסֶת שֶׁיֹּאמְרוּ שֶׁלֹּא קָרָא הָרִאשׁוֹן אֶלָּא ב' פְּסוּקִים. הַגָּה: וְאֵין חִלּוּק בֵּין פ' פְּתוּחָה לִסְתוּמָה; וּפָרָשָׁה שֶׁאֵינָהּ רַק ב' פְּסוּקִים, מֻתָּר לְשַׁיֵּר בִּתְחִלָּה וּלְהַפְסִיק שָׁם (תְּרוּמַת הַדֶּשֶׁן סִימָן כ"ב). וִיכַוֵּן שֶׁיַּתְחִיל תָּמִיד לִקְרֹא בְּדָבָר טוֹב, וִיסַיֵּם בְּדָבָר טוֹב (אוֹר זָרוּעַ וּמַיְמוֹנִי פֶּרֶק י"ג מה"ת) וְע"ל סִימָן תכ"ח.
1 To Not Leave Over Less Than 3 Verses In a Parsha. Containing 1 Se'if: The one who reads from the Torah may not leave over any less than 3 verses in a paragraph because [we are concerned for] those who leave the synagogue then, that they will say that the oleh (i.e. reader) after him will only read the two remaining verses [of the paragraph]. And similarly, one may not begin less than 3 verses into it (i.e. a paragraph) because of those who enter the synagogue then, that they will say that the first [reader] only read 2 verses. Rema: And there is no difference between an open paragraph and a closed paragraph. And a paragraph that only has two verses: it is permitted to leave over [these two verses] at the beginning [of a paragraph] and to stop there (T'rumat HaDeshen, siman 22). And one should aim to always begin to read on a good matter and to end on a good matter (Or Zarua and Meimoni, Chapter 13 of Hilkhot T'fillah). And see below, Chapter 428.