Asking Allah by the righteous Muslims is permissible. No one on the right path, from the (Salaf) or the (Khalaf) objected to this. The Salaf are those who lived in the first three centuries dating from the migration of the Prophet. The Khalaf are those who came after them. It is narrated in the hadith that during his caliphate in the year of the drought, ^Umar asked Allah for rain by al-^Abbas saying, ‘O Allah, we ask You by the Uncle of our Prophet’. They were granted rain.” (Related by al-Bukhariyy).