משנה: הַכּוֹתֵב שְׁתֵּי אוֹתִיּוֹת בְּהֶעְלֵם אֶחָד חַיָיב. כָּתַב בִּדְיוֹ בְּסַם בְּסִיקְרָא בְּקוֹמוֹס וְקַלְקַנְתּוֹס וּבְכָל דָּבָר שֶׁהוּא רוֹשֵׁם עַל שְׁנֵי כוֹתְלֵי הַבַּיִת וְעַל שְׁנֵי דַפֵּי פִּינַקְס וְהֵן נֶהְגִּין זֶה עִם זֶה חַיָיב. הַכּוֹתֵב עַל בְּשָׂרוֹ חַיָיב. וְהַמְסָרֵט עַל בְּשָׂרוֹ רִבִּי אֱלִיעֶזֶר מְחַיֵיב חַטָּאת וְרִבִּי יְהוֹשֻׁע פּוֹטֵר:
MISHNAH: One who writes two letters in one oblivion is liable. He is liable if he wrote in ink, by chemicals, in vermilion, with gum, with vitriol of copper, with anything which leaves a record, on two walls of a house or two leaves of a wooden book if they can be read together. One who writes on his body is liable. If he scratches on his flesh, Rebbi Eliezer declares him liable but Rebbi Joshua declares him not liable.