Genesis 27:44

וְ יָשַׁבְתָּ עִמֹּו יָמִים אֲחָדִים עַד אֲשֶׁר תָּשׁוּב חֲמַת אָחִיךָ

and you have sat with him days of ones,⁹¹⁹ until which she is turning back, the fury, of your brother,

919	Hebrew achadim אֲחָדִ֑ים, one in the plural form.