Reference for Pesachim 234:9

אמר רבה בר שילא דצלותא מצמיח קרן ישועה דאפטרתא מגן דוד

Because it is supplication. R'Aha B'Jacob said: And he must refer to the Egyptian exodus in the kiddush of the day. [For] here it is written, that thou mayest remember the day [when thou camest forth out of the land of Egypt],<span class="x" onmousemove="('comment',' Deut. XVI, 3.');">⁷</span>

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