סימן צח סעיף ד

אָסוּר לְבַקֵּעַ עֵצִים אוֹ אֲפִלּוּ לְשַׁבְּרָן בַּיָּד. וְאָסוּר לְלַקֵּט עֵצִים מִמָּקוֹם שֶׁהֵם מְפֻזָּרִין.

You may not split wood,²²If the logs are too large to use for fuel, you may cut them with a knife or by hand. (Shulchan Aruch 501:1) The Kitzur Shulchan Aruch refers to such wood that can be burned for fuel as is. See Shulchan Aruch 501:2. It is prohibited because it is a bother. or even break it by hand.²³Cutting small pieces (like match sticks) is a melachah de’oraisa of grinding. (Shulchan Aruch Harav, see Taz) It is also forbidden to gather wood from a place²⁴I.e. in your yard, because it appears as though you are doing it for your weekday needs. If they are scattered in the field, gathering them is a melachah de’oraisa (me’ameir-gathering). You may not take wood from a field, even if it is not scattered. This is a rabbinical prohibition lest you gather scattered wood. (see Magein Avraham 501:6, Shulchan Aruch Harav) where it is scattered about.

תנא דבי אליהו כל השונה הלכות בכל יום מובטח לו שהוא בן העולם הבא שנאמר הליכות עולם לו אל תקרי הליכות אלא הלכות (נדה ע"ג.)