Musannaf Ibn Abi Shaybah

Hazrat Abdur Rahman bin Abi Laila says that if you are able to make the water reach the roots of the beard, then definitely do so.

Hazrat Ash'ath says that I saw Hazrat Ibn Sirin washing his beard, so I asked, "Is washing the beard a Sunnah?" He replied, "No."

Hazrat Ibn Jurayj says that Hazrat Ata used to make the water of ablution reach the roots of the beard.

Hasan Basri says that Hazrat Ubaidah and Ibrahim considered it preferable that the water of ablution should reach the roots of the beard.

Hazrat Ibn Sabit says that when you perform ablution, do not forget to let the water reach up to the jaws.

Hazrat Saeed bin Jubair says that it is strange that a person washes his beard before the hair grows, but after the beard hair appears, for some reason he does not wash it!