And the sign
'owth  (oth)
a signal, as a flag, beacon, monument, omen, prodigy, evidence, etc. -- mark, miracle, (en-)sign, token.

---

or the wonder
mowpheth  (mo-faith')
a miracle; by implication, a token or omen -- miracle, sign, wonder(-ed at).

---

come to pass
bow'  (bo)
to go or come (in a wide variety of applications)

---

whereof he spake
dabar  (daw-bar')
perhaps properly, to arrange; but used figuratively (of words), to speak; rarely (in a destructive sense) to subdue

---

unto thee saying
'amar  (aw-mar')
to say (used with great latitude)

---

Let us go
yalak  (yaw-lak')
to walk; causatively, to carry (in various senses)

---

after
'achar  (akh-ar')
the hind part; generally used as an adverb or conjunction, after (in various senses)

---

other
'acher  (akh-air')
hinder; generally, next, other, etc. -- (an-)other man, following, next, strange.

---

gods
'elohiym  (el-o-heem')
angels, exceeding, God (gods)(-dess, -ly), (very) great, judges, mighty.

---

which thou hast not known
yada`  (yaw-dah')
to know (properly, to ascertain by seeing); used in a great variety of senses, figuratively, literally, euphemistically and inferentially

---

and let us serve
`abad  (aw-bad')
to work (in any sense); by implication, to serve, till, (causatively) enslave, etc.

---

them

Parallel Verses

New American Standard Bible
and the sign or the wonder comes true, concerning which he spoke to you, saying, 'Let us go after other gods (whom you have not known) and let us serve them,'

King James Bible
And the sign or the wonder come to pass, whereof he spake unto thee, saying, Let us go after other gods, which thou hast not known, and let us serve them;

Holman Christian Standard Bible
and that sign or wonder he has promised you comes about, but he says, 'Let us follow other gods,' which you have not known, 'and let us worship them,'

International Standard Version
that takes place, and then he may tell you, 'Let's follow other gods (whom you have not known) and let's serve them.' Even though the sign or portent comes to pass,

NET Bible
and the sign or wonder should come to pass concerning what he said to you, namely, "Let us follow other gods"--gods whom you have not previously known--"and let us serve them."

GOD'S WORD® Translation
What he predicts may even take place. But don't listen to that prophet or dreamer if he says, "Let's worship and serve other gods." (Those gods may be gods you've never heard of.)

King James 2000 Bible
And the sign or the wonder comes to pass, of which he spoke unto you, and he says, Let us go after other gods, which you have not known, and let us serve them;

Links

Deuteronomy 13:2
Deuteronomy 13:2 NIV
Deuteronomy 13:2 NLT
Deuteronomy 13:2 ESV
Deuteronomy 13:2 NASB
Deuteronomy 13:2 KJV