Part of speech: relative pronoun
Gender: masculine
(fem sei) he who; he that (also izē)
[← is pers pron masc, si pers pron fem + -ei part (vid ei)]
ize - masc - Matth. V, 32; Mrk. IX, 1; Luk. VIII, 13; VIII, 15; 1 კორ. XV, 57; Ephes. IV, 15; Galat. I, 1; Tim. I, I, 16
izei - masc - Matth. VII, 15; Jhn. VIII, 40; XI, 37; XII, 4; XV, 26; XVI, 2; XIX, 12 etc
sei - fem- Luk. I, 26; I, 36; II, 4; II, 5; II, 10; VII, 37; VII, 39; VIII, 2; XV, 12 etc

3.6. Relative pronouns

Relative pronouns in Gothic are derived by means of the addition of the part -ei to the demonstrative pronouns: saei (who, that, which) (masc), þatei (which; that) (neut) and soei (who, that, which) (fem). This derived form is declined in the same way as the plain demonstr pron, with the part -ei being added to the case endings of the demonstr pron in question. cf masc, Nom saei, Gen þizei, Dat þammei, Acc þanei, etc; fem, Nom soei, Gen þizozei, Dat þizaiei, Acc þoei etc rel pron-s saei, þatei, soei are often used in Gothic, introducing subordinate clauses.

Alongside masc sing Nom saei, Gothic often uses the form izei (< pers pron is (3 pers, sing, masc) + part -ei). izei was often used in subordinate clauses as a kind of petrified relative pronoun; cf þaim izei qimand at izwis ((those) who come to you( (Matth. 7:15); niu mahta sa izei uslauk augona þamma blindin ... (could not this man, who opened the eyes of the blind …) (Jhn. 11:37). Similarly, alongside rel pron soei (fem sing Nom) there is used rel pron sei (< pers pron si (3 pers, sing, fem) + part -ei). Remarkably, sei is used exclusively in Nom, sing.