Midrash sur Les Nombres 14:5

(Fol. l4b) R. Elazar said: "A prominent man must not clothe himself in sackcloth [when in distress], unless he knows for certainty that his prayers will be answered, as was the ease with King Jehoram, the son of Achab, concerning whom it is said (II Kings 6, 30) And it came to pass when the king heard the words of the woman, that he rent his clothes — now he was passing by the wall and the people looked, and behold, he had sackcloth within upon his flesh." R. Elazar said further: "Not everyone has the right to fall upon his face nor has everyone the right to rend his clothes, [as a sign of grief]; only for such as Moses and Aaron does it behoove to fall upon their faces; but for men like Joshua and Caleb it is fitting that they rend their garments." Moses and Aaron fell upon their faces, as it is said (Num. 14, 5) And Moses and Aaron fell, etc.; Joshua and Caleb rent their garments, b. Nachmeni, however, objected and said: and Kaleb the son of Jephune of those that had spied out the land, rent their garments. R. Zera, and according to others R. Samuel b Nachmeni, however objected and said: "If it were said. Joshua and Caleb rent their garments, the statement of R. Elazar would be correct; but as it states, And Joshua and Caleb rent, etc., [in a co-ordinate term] it signifies that they did both [fall upon their faces and rend their garments] ."