It is forbidden to say the following expressions:
Had it not been for Allah and you!, I have no one but Allah and you!, I begin in the name of Allah and your name! etc.

Allah’s Messenger (Peace be upon him) says: “Do not say ‘what Allah and so and so, willed’, but say ‘what Allah, then so and so, willed”‘. (Abu Dawud and Ahmed)

Scholars say: it is permissible to say, “Had it not been for Allah then so and so”. But, “Had it not been for Allah and so and so”, is not permissible to be said.

Q 48: What is the difference between “and” and “then” in these expressions?

A) The conjunction “and” suggests comparison and equality. So, one who says: “What Allah and you willed”, compares the Will of Allah and the will If the slave, and puts them on equal terms. Whereas, he conjunction “then” suggests subordination and following. So, one who says: “What Allah then you willed” , he declares that the will of the slave is subordinate to and follow the Will of Allah Almighty. Almighty Allah says in His Glorious Qur’an, {But you cannot will, unless Allah wills}. Al- Insan, 30) And so are the rest of the aforementioned expressions!

Source : 200 FAQ ON MUSLIIM BELIIEF -Shiekh Hafiz Ibn Ahmed Al Hakami
Translated by ‘Ali As-Sayed Al-Halawani