Reference for Pesachim 14:17

מאי ואומר

but what is the reason for the shofar? And should you say, because he may sound the blast [teki'ah] incorrectly;<span class="x" onmousemove="('comment',' In which case the obligation is not fulfilled and the benediction was unnecessarily recited, which is prohibited.');">²¹</span>

Jastrow

Jastrow