לְהַעֲל֤וֹת חֵמָה֙ לִנְקֹ֣ם נָקָ֔ם נָתַ֥תִּי אֶת־דָּמָ֖הּ עַל־צְחִ֣יחַ סָ֑לַע לְבִלְתִּ֖י הִכָּסֽוֹת׃ (פ)
Habiendo, pues, hecho subir la ira para hacer venganza, yo pondré su sangre sobre la dura piedra, para que no sea cubierta.
Mishnah Rosh Hashanah
Originally they used to light torches [to signal that the new month had been decreed]. When the Samaritans disrupted this, they decreed that messengers should go out.