וְאִשָּׁ֥ה אֶל־אֲחֹתָ֖הּ לֹ֣א תִקָּ֑ח לִצְרֹ֗ר לְגַלּ֧וֹת עֶרְוָתָ֛הּ עָלֶ֖יהָ בְּחַיֶּֽיהָ׃
Targum Jonathan on Leviticus
Neither shalt thou take a wife in the lifetime of her sister, to aggrieve her by dishonouring her nakedness, over her, all the days of her life.