Thine (determiner)
Singular second person prevocalic possessive determiner (preconsonantal form: thy).
Thine (pronoun)
Singular second person possessive pronoun.
Thy (determiner)
The possessive form of thou: that belongs to thee; that belongs to you singular.
Thy (conjunction)
because.
Wiktionary
Thine (pronoun)
archaic form of yours; the thing or things belonging to or associated with thee
“his spirit will take courage from thine”
Thine (determiner)
form of thy used before a vowel
“inquire into thine own heart”
Thy (determiner)
archaic or dialect form of your
“honour thy father and thy mother”
Oxford Dictionary