Writing verses on the wall of one’s Sukkah:[1]
One may not write or engrave verses of scripture, such as “Basukkos Teishvu” on items or walls of the Sukkah, as it is forbidden to write verses of the Torah unless one is writing them in a complete Sefer[2], and engraving is just like writing regarding this matter. Thus, those people who engrave the verse of Basukkos Teishvu on a pumpkin and hang it on the Sukkah as a decoration need to be protested. [Practically, however, many are lenient in this matter especially if one is skipping a few letters from the verse, or not spelling out Hashem’s name.[3]]
[1] Admur 638:20; M”A 638:9; M”B 638:24
[2] See Admur 284:4; 334:13; Michaber Y.D. 283:2 and 4; Taz 283:1 and 3; Shach 283:6
[3] Bikureiy Yaakov 638:18 based on Shach ibid that the widespread custom is to be lenient in this especially by our script; See also Sukkah Kehilchasa 7 footnote 6 that the prohibition is only against writing the verses, however if the verses were already written then they may be purchased and hung up; Piskeiy Teshuvos 638:8