Reference for Yevamot 4:5

מִצְוָה בַגָּדוֹל לְיַבֵּם. לֹא רָצָה, מְהַלְּכִין עַל כָּל הָאַחִין. לֹא רָצוּ, חוֹזְרִין אֵצֶל גָּדוֹל וְאוֹמְרִים לוֹ, עָלֶיךָ מִצְוָה, אוֹ חֲלֹץ אוֹ יַבֵּם:

It is a mitzvah for the elder brother to perform the yibum [as we derive from (Deuteronomy 25:5): "And it shall be the first-born, etc." (see 2:8)]. If he demurred, we "go through" all the brothers (in descending order of age). If they demurred, we return to the eldest and say to him: "The mitzvah devolves upon you — either give her chalitzah or take her in yibum!"

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