When he was still a teenager, “he started to search for the God of David, ” and by the time he was 20, he began to cleanse Judah of idolatry.
وَعِنْدَمَا بَلَغَ ٱلْعِشْرِينَ مِنْ عُمْرِهِ ،‏ رَاحَ يُطَهِّرُ يَهُوذَا مِنَ ٱلْأَصْنَامِ .‏ ‏