Bi-iznillāh is interpreted in two ways:
1. The phrase bi-iznillāh (by Allah's permission) is sometimes used in reference to something for which Allah has not given permission; as in the following verses:
They could not harm anyone with it except by Allah's permission {that is, unless Allah permitted harm to come to that person}. (al-Baqara 2:102)
No person can die except by Allah's permission {that is, unless Allah has permitted that person's death}. (Āl ʿImrān 3:145)
No person can believe except by Allah's permission {that is, unless Allah has permitted that person to have iman (faith)}. (Yūnus 10:100)
2. Al-izn is also used in the sense of 'command', as in the following verses:
We did not send any messenger except so that he would be obeyed by Allah's permission {that is, by Allah's command}. (al-Nisāʾ 4:64)
No messenger can bring a verse [miracle] except by Allah's permission {that is, by Allah's command}. (al-Raʿd 13:38)
So that you may bring mankind out of darkness into light by the permission of their Lord {that is, by their Lord's command}... (Ibrāhīm 14:1)
It gives its fruit at all times by the permission of its Lord {that is, by its Lord's command}. (Ibrāhīm 14:25)
We could not bring you any authority except by Allah's permission {that is, by Allah's command}. (Ibrāhīm 14:11)
They will abide therein by the permission of their Lord {that is, by Allah's command}. (Ibrāhīm 14:23)