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waqālū
And they say
CONJ – prefixed conjunction wa (and) + V – 3rd person masculine plural perfect verb + PRON – subject pronoun waw
Root Link: ق و ل
lan
Never
NEG – negative particle
Root Link: ل ن
nu'mina
we will believe
V – 1st person plural (form IV) imperfect verb, subjunctive mood
Root Link: ا م ن
laka
in you
P – prefixed preposition lām + PRON – 2nd person masculine singular personal pronoun ka
Root Link: ل
ḥattā
until
P – preposition
Root Link: ح ت ت ى
tafjura
you cause to gush forth
V – 3rd person masculine plural (form IV) imperfect verb
Root Link: ف ج ر
lanā
for us
P – prefixed preposition lām + PRON – 1st person plural personal pronoun nā
Root Link: ل
mina
from
P – preposition
Root Link: م ن
l-arḍi
the earth
DET – determiner prefix al + N – genitive feminine noun 
Root Link: ا ر ض
yanbūʿan
a spring
N – accusative masculine indefinite noun
Root Link: ن ب ع

Acknowledgements:

Single-Word Audio has been made possible through software provided by Arabic NLP

James Ada's concordance work; his research can be found at www.organizedQuran.com
Note: James is now a member of the IslamAwakened Continuity Board