Reference for Niddah 6:4

כֹּל הָרָאוּי לָדוּן דִּינֵי נְפָשׁוֹת, רָאוּי לָדוּן דִּינֵי מָמוֹנוֹת. וְיֵשׁ שֶׁרָאוּי לָדוּן דִּינֵי מָמוֹנוֹת וְאֵינוֹ רָאוּי לָדוּן דִּינֵי נְפָשׁוֹת. כֹּל הַכָּשֵׁר לָדוּן, כָּשֵׁר לְהָעִיד. וְיֵשׁ שֶׁכָּשֵׁר לְהָעִיד וְאֵינוֹ כָשֵׁר לָדוּן:

Anyone who is fit to [be a judge who may] try capital cases is also fit to try monetary cases. But there may be one who is fit to try monetary cases but is unfit to try capital cases. Anyone who is valid to serve as a judge is valid to testify. But there may be one who is valid to testify and is not valid to serve as a judge.

Jastrow