Part of speech: verb
Verb type: strong verb (3)
Present participle: wairpands
(Acc, Dat) to cast, throw; hlauta waírpan to cast lots (for something)
[← Prot-Germ *werpan; OE weorpan (Mod E warp); O Fris werpa, warpa; O Sax werpan; Dt werpen; OHG werfan (Mod G werfen) Icel verpa; Dan, Norw verpe; Sw värpa)]
wairpiþ - 3 pers, sing, pres, indicat - Mrk. IV, 26
wairpam - 1 pers, pl, pres, indicat - Luk. V, 5
waurpeina - 3 pers, pl, p, optat - Jhn. VIII, 59; X, 31
wairpan - inf- Mrk. VII, 27
wairp - 2 pers, sing, imper - Matth. V, 29; V, 30; Mrk. XI, 23; Luk. IV, 9
wairpands - pres.p.- Mrk. I, 16; XII, 4; XV, 24; Skeirns. III, 8

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