There is a clear halachah in Shulchan Aruch (230:1) that a prayer on the past is a wasted prayer. The two examples offered are based on a Mishnah and Gemara in Berachos.

Gittin 33Jan 15, 20164 min

The story is told that someone approached the Chasam Sofer with a dilemma. This man had a Torah scroll in his possession, but he was unsure if the scribe who wrote it was Jewish, or if perhaps it was written by a…

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