Does the prayer become invalid if the follower finishes the greeting before the imam?

Question

A follower finishes the greeting before the imam without intention.

Answer 1

Peace be upon you and God's mercy and blessings.

Ayatollah Khamenei and Ayatollah Sistani (may Allah protect them):

The prayer does not become invalid in this case.

May you be successful in all good.

---

Source:

Ayatollah Khamenei (may Allah protect him): Message on Prayer and Fasting, Prayer, Congregational Prayer, Duties of the Follower, Article 732

Ayatollah Sistani (may Allah protect him): Minhaj al-Salihin, Vol. 1, Rules of Congregational Prayer, Article 815