Related for Megillah 3:6
בַּחֲנֻכָּה, בַּנְּשִׂיאִים (שם ז). בְּפוּרִים, וַיָּבֹא עֲמָלֵק (שמות יז). בְּרָאשֵׁי חֳדָשִׁים, וּבְרָאשֵׁי חָדְשֵׁיכֶם (במדבר כח). בַּמַּעֲמָדוֹת, בְּמַעֲשֵׂה בְּרֵאשִׁית (בראשית א). בַּתַּעֲנִיּוֹת, בְּרָכוֹת וּקְלָלוֹת (ויקרא כו). אֵין מַפְסִיקִין בַּקְּלָלוֹת, אֶלָּא אֶחָד קוֹרֵא אֶת כֻּלָּן. בַּשֵּׁנִי וּבַחֲמִישִׁי וּבְשַׁבָּת בַּמִּנְחָה, קוֹרִין כְּסִדְרָן, וְאֵין עוֹלִין לָהֶם מִן הַחֶשְׁבּוֹן, שֶׁנֶּאֱמַר (ויקרא כג), וַיְדַבֵּר מֹשֶׁה אֶת מֹעֲדֵי יְיָ אֶל בְּנֵי יִשְׂרָאֵל, מִצְוָתָן שֶׁיְּהוּ קוֹרִין כָּל אֶחָד וְאֶחָד בִּזְמַנּוֹ:
On Channukah we read in the Nesi'im (the chiefs of the tribes) (Numbers 7). On Purim: "And Amalek came" (Exodus 17:8). On Rosh Chodesh: "And in the beginnings of your months" (Numbers 28:11). On the (convening of) the ma'amadoth (see Ta'anith 4:2) the reading is in the (account of the) creation, [heaven and earth "standing" on the offerings. The order of the readings is given in Ta'anith 4:3.] On fast days, we read in the blessings and the curses. ["If in My statutes, etc." (Leviticus 26:3) to impress upon them that troubles come to the world as a result of sin, so that they repent to escape them.] No break is made in (the reading of) the curses, but one (reader) reads all of them. On Monday, Thursday, and the minchah of Shabbath we read in the sidrah [of the week], and it is not "credited" to the (full) amount [i.e., when Shabbath arrives, they read again what they read on those days] — as it is written [This refers to the entire Mishnah, the source of the mitzvah for reading about the festival on the day of the festival] (Leviticus 23:44): "And Moses declared the appointed times of the L-rd to the children of Israel" — It is a mitzvah to read of each in its (appointed) time.