Part of speech: verb
Verb type: strong verb (3)
1. to bury; 2. (sik) to hide (oneself)
[← ga- pref + filhan v; OE ȝeféolan; OHG gifelahan, gifelhan]
gafalh - 3 pers, sing, p, indicat - Jhn. VIII, 59; XII, 36
gafilhan - inf- Matth. VIII, 21; VIII, 22
gafulhans - p.p.- Luk. XVI, 22

In the combination sonant + occlusive, r, l, m, n were initially syllable-forming sounds, but already in the Common Germanic period, before r, l, m, n there began to appear the so-called epenthetic (inserted) vowel, which in Gothic always produced [-u-]

III class infinitive preterite singular preterite plural past participle
normal grade normal grade zero grade zero grade
i/ă -i- -a- zero zero
additional element of vowel gradation for this class is sonant + any consonant, e.g. -nd-, -rþ-, etc. i + nd = ind a + nd = and epenthetic u + nd = und epenthetic u + nd = und
to bind; to tie bindan band bundum bundans
i + rþ = airþ [-ɛ-] a + rþ = arþ epenthetic au [-o-] + rþ = aurþ [-orþ-] epenthetic au [-o-] + rþ = aurþ [-orþ-]
to become, turn into something wairþan
warþ waúrþum

See the complete paradigm of the conjugation of strong verbs