As we begin the weeks of Shovavim (the upcoming 6 parshiyos, Shemos through Mishpatim), many of us will notice signs going up all around us for improvement in keeping the Halachos of Niddah ("Taharas Hamishpacha"), and classes available weekly. My question is what is the earliest source linking these two together (i.e. a source that says one should study these topics during these weeks). Feel free to provide any and all sources.
This question is different than Why is the period of Shovavim connected to tikkun habris?, as I am asking for:
- the earliest source
- specifically discussing learning about this rather than Teshuva or other Tikkunim
- specifics relating to Taharas Hamishpacha, not just Tikun Habris in general