Musannaf Ibn Abi Shayba 6:1334

Waki’ narrated to us, Isra’il narrated to us, from Ishaq, from ‘Amir ibn Sa’d al-Bajali, from Abu Mas’ud, Thabit ibn Zayd, and Qurzah ibn Ka’b, they said: It was permitted for us to weep over the deceased, provided it is not wailing (niyah).