Talmud for Rosh Hashanah 32:1

ותוקעין ומריעין כשהן עומדין כדי לערבב השטן

and then again sound a teki'ah and teru'ah standing? - It is so as to confuse the Accuser.<span class="x" onmousemove="('comment',' Heb. 'Satan'. The devotion of the Jews to the precepts nullifies Satan's accusation against them (Rashi) . [The Shofar on New Year is blown twice: once at the close of the morning prayer and the reading of the Law when the congregation is seated, and again during the Musaf prayers while the people stand. According to J.R.H. IV, 8 the Shofar was originally blown only at the morning service, whence it was transferred to a later hour in the Musaf because their enemies on one occasion took the Shofar blasts early in the morning as a call to arms, whereupon they attacked the Jews. The custom of blowing the Shofar at Musaf service was retained even after the rite had been restored to the morning service].');">¹</span> R'Isaac further said: If the shofar is not sounded<span class="x" onmousemove="('comment',' [This does not apply where New Year falls on Sabbath, in which case the Shofar may not be blown, but where the rite was omitted through some other cause (Tosaf.) ].');">²</span> at the beginning of the year, evil will befall at the end it.

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