Shabbos12: 2
הַחוֹרֵשׁ כָּל־שֶׁהוּא; הַמְנַכֵּשׁ, וְהַמְקַרְסֵם, וְהַמְזָרֵד, כָּל־שֶׁהוּא, חַיָּב. הַמְלַקֵּט עֵצִים, אִם לְתַקֵּן, כָּל־שֶׁהֵן; אִם לְהֶסֵּק, כְּדֵי לְבַשֵּׁל בֵּיצָה קַלָּה. הַמְלַקֵּט עֲשָׂבִים, אִם לְתַקֵּן, כָּל־שֶׁהוּא; אִם לִבְהֵמָה, כִּמְלֹא פִי הַגְּדִי.
One who plows any amount; one who weeds, or prunes dry branches, or prunes young shoots, in any amount, is liable. One who gathers wood, if [his intent is] to effect an improvement, [he is liable for] any amount if [his intent is] for kindling, [he is liable] for the amount [of wood] required to cook an easily cooked egg. One who gathers grasses, if [his intent is] to effect an improvement, [he is liable for] any amount; if [his intent is] for animal [fodder], [he is liable] for as much as a kid’s mouthful.
Shabbos12: 3
הַכּוֹתֵב שְׁתֵּי אוֹתִיּוֹת, בֵּין בִּימִינוֹ בֵּין בִּשְׂמֹאלוֹ; בֵּין מִשֵּׁם אֶחָד בֵּין מִשְּׁנֵי שֵׁמוֹת; בֵּין מִשְּׁנֵי סַמְמָנִיּוֹת; בְּכָל לָשׁוֹן, חַיָּב. אָמַר רַבִּי יוֹסֵי: לֹא חִיְּבוּ שְׁתֵּי אוֹתִיּוֹת אֶלָּא מִשּׁוּם רֹשֶׁם, שֶׁכָּךְ הָיוּ כוֹתְבִין עַל קַרְשֵׁי הַמִּשְׁכָּן, לֵידַע אֵיזוֹ בֶן זוּגוֹ. אָמַר רַבִּי: מָצִינוּ שֵׁם קָטָן מִשֵּׁם גָּדוֹל, שֵׁם מִשִּׁמְעוֹן וּשְׁמוּאֵל, נֹח מִנָּחוֹר, דָּן מִדָּנִיֵּאל, גָּד מִגַּדִּיאֵל.
One who writes two letters, whether with his right hand or his left; whether of one character or of two characters; whether with two inks; in any language, he is liable. R’ Yose says: They declared [writing] two letters liable only because of mark-ing, for thus would they write on the boards of the Mishkan, to know which ones were mates. Rabbi [Yehudah HaNassi] said: We find a short name which is part of a long name, SHeM from SHiMon, or SHMuel, NoaCH from NaCHor, DaN from DaNiel, GaD from GaDiel.