(Ahsaab) 33 : 46
وَدَاعِيًا إِلَى اللَّهِ بِإِذْنِهِ وَسِرَاجًا مُنِيرًا
And a caller to Allah with His Permission, and as a reflecting light.
Permission is one of the 40 names of Adhikr. Inviting Allah should be with Adhikr (the Permission). In the ‘Sirajan Muneer (Reflecting) mentioned in verse, Siraj is the sun and Muneer is the Moon. Just like the moon is reflecting the light of the sun, Muhammed is reflecting Adhikr which is the Light of Lord Alla. Just like Adhikr is Light, Lord Allah is also Light of heavens and earth as told in verse 24: 35. See explanation 7: 157; 16: 125; 22: 65.