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laqad
Certainly
EMPH – emphatic prefix lām + CERT – particle of certainty
Root Link: ق د
raḍiya
was pleased
V – 3rd person masculine singular perfect verb
Root Link: ر ض و
l-lahu
Allah
PN – nominative proper noun
Root Link: ا ل ه
ʿani
with
P – preposition
Root Link: ع ن
l-mu'minīna
the believers
DET – determiner prefix al + N – genitive masculine plural (form IV) active participle
Root Link: ا م ن
idh
when
T – time adverb
Root Link: ا ذ
yubāyiʿūnaka
they pledged allegiance to you
V – 3rd person masculine plural (form III) imperfect verb + PRON – subject pronoun na + PRON – 2nd person masculine singular object pronoun ka
Root Link: ب ى ع
taḥta
under
N – accusative noun
Root Link: ت ح ت
l-shajarati
the tree
DET – determiner prefix al + N – genitive feminine noun 
Root Link: ش ج ر
faʿalima
and He knew
CONJ – prefixed conjunction fa (and) + V – 3rd person masculine singular perfect verb
Root Link: ع ل م
what
REL – relative pronoun
Root Link: م ا
(was) in
P – preposition
Root Link: ف ى
qulūbihim
their hearts
N – genitive feminine plural noun + PRON – 3rd person masculine plural object pronoun Ha
Root Link: ق ل ب
fa-anzala
so He sent down
REM – prefixed resumption particle fa + V – 3rd person masculine singular (form IV) perfect verb
Root Link: ن ز ل
l-sakīnata
the tranquility
DET – determiner prefix al + N – accusative feminine noun
Root Link: س ك ن
ʿalayhim
upon them
P – preposition + PRON – 3rd person masculine plural object pronoun Ha
Root Link: ع ل ى
wa-athābahum
and rewarded them
CONJ – prefixed conjunction wa (and) + V – 3rd person masculine singular (form IV) perfect verb + PRON – 3rd person masculine plural object pronoun Ha
Root Link: ث و ب
fatḥan
(with) a victory
N – accusative masculine indefinite noun
Root Link: ف ت ح
qarīban
near
ADJ – accusative masculine singular indefinite adjective
Root Link: ق ر ب

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