Комментарий к Бамидбар 33:18

ויחנו ברתמה AND THEY ENCAMPED IN RITHMAH — It was so called with reference to the slanderous speech of the spies, uttered there, as it is said, (Psalms 120:3-4): “What shall be given unto thee, and what shall be done more unto thee, thou deceitful tongue? Sharp arrows of the mighty with coals of juniper (רְתָמִים).

So named after [the spies’] slander. Rashi wishes to answer the question: Why here was it called Rismoh, while elsewhere it was called Paran? (Devek Tov) The reason why Rashi commented on this journey more than the others was that here it is written, “They journeyed from Chatzeiros and camped in Rismoh” while in Parshas Beha'aloscha (14:16) it is written “afterwards the people travelled from Chatzeiros and they camped in the desert of Paran.” Therefore, he explains that it was “so named after the slander…” meaning that both refer to the same place.