A person took an oath that he will not lie down on this mat. Thereafter he spread a sheet onto this mat and lied down. His oath will break. And if he placed some other mat or carpet onto the first mat and then lied down, his oath will not break.
A person took an oath that he will not sit on the ground. Thereafter, he laid a mat, carpet, straw mat, a cloth, etc. on the ground and then sat onto it. His oath will not break. But if he spread a part of the clothing that he is wearing, or if a woman spread a part of her head covering while she is wearing it, and then sat down; the oath will break. If the clothing or head covering was removed completely from one’s body, placed onto the ground and then the person sat down, the oath will not break.
A person took an oath that he will not sit on this bed or couch. Thereafter, he laid a mat or a piece of carpet onto that bed or couch. His oath will break. But if another bed or another couch is placed onto the first bed or couch, his oath will not break by sitting on the top bed or couch.