# brought out the king's son Joash
Jehoiada, the high priest, brought king Ahaziah's son, Joash, out from the temple apartment where he had been raised in hiding.
# gave him the covenant decrees
"presented him with the book of the law"
# anointed him
The priest poured olive oil on the head of Joash as a symbol that he was now the king. Alternate translation: "poured some olive oil on Joash's head" (See: [[rc://en/ta/man/translate/translate-symaction]])
# clapped their hands
Clapping their hands was a sign of the happiness of the people at the anointing of the new king.