What is the ruling on an Imam shortening the first rak'ah and lengthening the second?

Chapter on the Description of Prayer

Al-Mughni

Book of Prayer

Book 3 · Issue 3 · Bab 5

Open in Qurani

Primary text

It is not appropriate for an Imam to shorten the first rak'ah and lengthen the second; he is told this and commanded to change the practice.