اللذي او الذي. الاسمُ الموصولُ

The adjective also becomes perpetually in the singular unless the attribute or related referent is a broken plural, in which case the adjective may be pluralized, though this is relatively uncommon and some traditional grammarians criticize it
literally "The bird stood on a tree great indefinite, feminine, singular, genitive [are] its branches plural of an inanimate masculine noun "• Thus, when the relative pronoun is the object of a verb or a preposition, a pronominal clitic that references and agrees with the "relative pronoun" in gender and number is added after the respective verb or preposition while the relative pronoun itself remains at the beginning of the clause, though the addition of clitics after verbs and participles is optional just as when nouns in verbal sentences are fronted Hence, relative pronouns are classified in traditional Arabic grammar as a subcategory of nouns

literally "So ordain what[ever] you [are] ordaining" Syntactically, this differs from, for example, English, where relative pronouns replace nouns as in , , , and and determiners as in and in the relative clause.

3
مَثَل قارئ القرآن
In its new position, the adjective agrees with the antecedent in case and definiteness and with the noun denoting the attribute or associated referent in gender
اعلمت اشرف او اجل من الذي يبني وينشئ انفسا وعقولا
literally "This [is] a man his hair [is] long" If the relative clause includes a predicative adjective qualifying an attribute of the antecedent or another referent related to or associated with it, the adjective may be moved to the front of the clause, in which case the relative pronoun is obligatorily omitted
الشكل الذي لا يوجد له أوجه أو قواعد أو أحرف أو رؤوس هو
If the antecedent is indefinite, the relative pronoun is obligatorily omitted, regardless of the structure of the relative clause
Milton Cowan, editor, A Dictionary of Modern Written Arabic, 4th edition, Ithaca, NY: Spoken Language Services,

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المزيج الذي يتكون من مادتين او اكثر هو
ماهو الشيء اللذي هو لغيرك .. وكنت تتمنى لو أنك فعلت مثله
ما أصل كلمة الذي ؟ ولماذا لا تكتب اللذي ؟