מדרש אויף עמוס 3:8

(Ib. b) The Caesar said unto R. Joshua b. Chanania: "Your God is likened unto a lion, as the passage says (Amos 3, 8) The Lion hath roared, who will not fear. What is there remarkable about it? Does not a hunter kill a lion?" "He is not likened unto an ordinary lion," was the reply of R. Joshua; "but He is likened unto the lion of the forest of Ilai." "If so then I would like to see such a lion," came the request of the Caesar. "You cannot see it," R. Joshua answered. "But I must see it," insisted the Caesar. Whereupon R. Joshua prayed and caused the lion [of the forest Ilai] to move from its place. When it reached a distance of four hundred Parsahs [from Rome] it gave forth a roar which caused miscarriage to the pregnant women and the tower of Rome to tremble to the point of falling. When it reached three hundred Parsahs, it gave forth another roar, which caused the falling out of the teeth of every person, and the Caesar himself fell off the throne. The Caesar then said to R. Joshua: "I beg of thee, pray for mercy that it should return back to its place." R. Joshua thereupon prayed and it caused the lion to return to its place.

Similarly, (Amos 3:8) "The lion has roared. Who will not fear? (The L–rd G–d has spoken. Who will not prophesy?") Who has given power and strength to the lion? Is it not He? (i.e., What need have we, then, of epithets?) We use the epithet of His creations to "help" the ear (by what it is accustomed to hear.)

Chapter 8: Prophets. [1] "The Lord's wrath I will bear, for I have sinned against him" (Micah 7:9).Just as when a lion roars, the animals tremble, so too does the Holy One, blessed be He, roar, as it is said, "The lion has roared, who will not fear? The Lord GOD has spoken, who can but prophesy?" (Amos 3:8). Come and see: how stubborn is this nation! When the Holy One, blessed be He, said to Moses, "I will send an angel before you... and drive out [the Canaanites]" (Exodus 33:2), Moses said before Him, "Master of the Universe! You send an angel to all these nations, but not to us?" (Exodus 33:15). The Holy One, blessed be He, said to him, "I swear by your life, if I sent an angel, when would I destroy them?" as it is said, "At what time do I send [an angel], and when do I destroy them?" (Exodus 23:27). It is said elsewhere, "roars like a lion" (Hosea 11:10), referring to the Holy One, blessed be He. However, regarding Israel, it is said, "and His will is like dew upon the grass" (Proverbs 19:12). Just as dew brings life to the world, so too does the Holy One, blessed be He, come like dew to Israel, as it is said, "I will be like the dew to Israel" (Hosea 14:6). Even when He is angry with them, He is still upon them like dew, as it is said, "and His will is like dew upon the grass." Israel said to Him, "For this reason we can stand, because You make Yourself like dew to us," as it is said, "And the remnant of Jacob shall be in the midst of many peoples like dew from the LORD" (Micah 5:6).