Translation:Mishnah/Seder Zeraim/Tractate Berakhot/Chapter 5/4/Translation

One who leads the prayers {lit. "passes before the ark"}

should not repond after [the blessing of] the kohanim [by saying] "Amen",

because [he may] lose his concentration [and become unable to begin the next blessing].

If there is no kohen there [to recite the Priestly Blessing],

He should not recite the Priestly Blessing {lit. "He should not lift his palms"}.

But, if he is confident that he will [be able to] recite the Priestly Blessing {lit. "lift his palms} and then return to his prayer,

he is permitted.