Aharon said in a loud voice, “Esteemed elders, I am here to relate to you an important message from HaShem. He has promised my brother Moshe, that He Himself is guaranteeing your imminent redemption out of slavery. You will witness amazing miracles and wonders! You will leave Egypt with great wealth!”
Then Moshe demonstrated the 3 miraculous signs in front of Bnei Yisrael.
“The staff turned into a snake!” “Your hand is as white as snow!” “The water became blood!”
“AMAZING! This is surely the hand of the Almighty!” they all exclaimed, as they bowed in gratitude to HaShem.