Ibn Taymiyah (may Allah have mercy on him) said:
The heavenly bodies are round, according to the Muslim scholars among the Sahaabah and those who followed them in guidance; that was also proven from them with isnaads mentioned in the appropriate places. In fact, more than one of the Muslim scholars narrated that there was consensus among the Muslims on that point.
End quote from Minhaaj as-Sunnah an-Nabawiyyah (5/442)

Ibn Hazm (may Allah have mercy on him) said:
The proofs of the Qur’an and Sunnah indicate that it is round.