Reference for Berakhot 61:5

ת"ר אין עומדין להתפלל לא מתוך דין ולא מתוך דבר הלכה אלא מתוך הלכה פסוקה

Our Rabbis have taught : One must not stand up to say the Tefillah immediately after being engaged in a lawsuit or the discussion of a Halakah ; but he may do so after the discussion of a Halakah which has been decided.

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