Commentary for Berakhot 29:12
מאן תנא חרש המדבר ואינו שומע דיעבד אין לכתחלה לא
Who is the authority for the teaching : [The Terumah separated by] a deaf man who speaks but cannot hear is post factum valid, but not ab initio?
Abraham Cohen Footnotes to the English Translation of Masechet Berakhot
In Rabbinic law a distinction is often drawn between the validity of an act which one contemplates doing and its validity after it has been performed; and it is sometimes decided that though the former (לְכַתְּחִלָּה "as at the beginning," ab initio) is illegitimate, nevertheless the accomplished fact דִיעֲבַד = דְּאִיעֲבַד "that which has been done," post factum) may be considered as complying with the requirements of the law. See Mielziner, p. 197 ; Bacher, Terminologie, ii. p. 232.
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