Gemara:

Berachot 

Halacha:

Beit HaKenesset,  Tefillah,  Yom Tov 

Yerushalmi:

Berachos 

Collections: R' Grunstein Hashem Hashem

References: Berachot: 33B ,  Berachot: 34A  

Description

On a weekday Yom Tov, we day the 13 attributes of mercy + ואני תפילתי three times when taking out the Torah. This seems to be a MAJOR problem of making people think that are a ח"ו davening to three G-ds.