Shows: inside 内 with one 一 further person 人, who is inside. (cf. third 丙)
Two connected 一 persons are inside, thus both

Outside: enclosure 冂, inside: person 人
The enclosure keeps the person inside.

Left: thread 纟/糸, right: inside 内 (Here: a thread 冂 around a person 人 for marking)
A thread wound around the person for marking a: receiving, accepting or paying.

Left: to show 礻(=示 image of an altar), right: chat, gossip 呙 (A mouth 口 as big as the chest 内 likes gossip.)
(At the altar, you should be reverently silent:) At the altar they had chats and gossips which caused the: disaster.

Left: mouth 口, right: inside 内 (The included 冂 person 人 is inside.)
The mouth shouts: "I want to come inside!" as a battle cry.

Left: metal 钅/金, right: inside 内 (The included 冂 person 人 is inside.)
(The pure sodium oxidizes very quickly and must constantly be stored in e.g. oil) The metal that is (always) 'inside' is: sodium.

Left: word 讠/言 (=sound waves out of a mouth 口), right: inside 内 (The included 冂 person 人 is inside.)
The words stay inside, when sb.: speaks slowly.