Deuteronomy 13:1

13:1 Suppose a prophet or one who foretells by dreams ¹  should appear among you and show you a sign or wonder, ² 

Deuteronomy 17:3

17:3 by serving other gods and worshiping them – the sun, ³  moon, or any other heavenly bodies which I have not permitted you to worship. ⁴ 

[13:1]  ¹ tn Heb “or a dreamer of dreams” (so KJV, ASV, NASB). The difference between a prophet (נָבִיא, navi’) and one who foretells by dreams (חֹלֵם אוֹ, ’o kholem) was not so much one of office – for both received revelation by dreams (cf. Num 12:6) – as it was of function or emphasis. The prophet was more a proclaimer and interpreter of revelation whereas the one who foretold by dreams was a receiver of revelation. In later times the role of the one who foretold by dreams was abused and thus denigrated as compared to that of the prophet (cf. Jer 23:28).

[13:1]  ² tn The expression אוֹת אוֹ מוֹפֵת (’ot ’o mofet) became a formulaic way of speaking of ways of authenticating prophetic messages or other works of God (cf. Deut 28:46; Isa 20:3). The NT equivalent is the Greek term σημεῖον (shmeion), a sign performed (used frequently in the Gospel of John, cf. 2:11, 18; 20:30-31). They could, however, be counterfeited or (as here) permitted to false prophets by the Lord as a means of testing his people.

[17:3]  ³ tc The MT reads “and to the sun,” thus including the sun, the moon, and other heavenly spheres among the gods. However, Theodotion and Lucian read “or to the sun,” suggesting perhaps that the sun and the other heavenly bodies are not in the category of actual deities.

[17:3]  ⁴ tn Heb “which I have not commanded you.” The words “to worship” are supplied in the translation for clarification.