Because.

Towards; in the direction of.
Directed at; intended to belong to.
In order to help, benefit, gratify, honor etc. (someone or something).
Befitting of someone’s beliefs, needs, wants, skills, or tastes; best suited to.
To be used or treated in a stated way, or with a stated purpose.
Supporting, in favour of.
Because of.
In order to cure, remove or counteract.
So as to allow (something or someone) to take position.
In anticipation of.
So as to identify or locate.
Over (a period of time).
Throughout or across (a distance in space).
Used to introduce a subject of a to-infinitive clause.
On behalf of.
In the role or capacity of; instead of; in place of.
In exchange for; in correspondence or equivalence with.
In order to obtain or acquire.
By the standards of, usually with the implication that those standards are lower than one might otherwise expect; considering.
To be, or as being.
Despite, in spite of.
Indicating something desired or anticipated.
Introducing the first item(s) in a potential sequence .
(US) In honor of; after.
(UK) Due for or facing (a certain outcome or fate).
(US) Out of; used to indicate a fraction, a ratio
Used as part of a score to indicate the number of wickets that have fallen.
(obsolete) Indicating that in prevention of which, or through fear of which, anything is done.
(nonstandard) So (that), in order to
Used in various other more-or-less idiomatic ways to construe individual verbs, indicating various semantic relationships such as target, purpose, result, etc.; see also the entries for individual phrasal verbs, e.g. ask for, look for, stand for, etc.

To, the particle for marking the following verb as an infinitive.

diu…

" They're not 🚫 Partícula for sale ," he 👨 Pronom said Verb .

"They're not for sale," he said. "They're not for sale," he said.

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" They're not
🚫

Partícula
for sale ," he
👨

Pronom
said
Verb
.

"They're not for sale," he said.
"They're not for sale," he said.