Albert Barnes Commentary John 11:31

"The Jews then who were with her in the house, and were consoling her, when they saw Mary, that she rose up quickly and went out, followed her, supposing that she was going unto the tomb to weep there." — John 11:31 (ASV)

Saying, She goes, to the grave. Syriac, "They thought that she went to weep." They had not heard Martha call her. The first days of mourning among the Jews were observed with great solemnity and many ceremonies of grief.