Reference: al-Majmoo’ fee Tarjamatil-Muhaddith Hammaad ibn Muhammad al-Ansaaree wa Seeratuhu wa Aqwaalauhu – Volume 2, Quote No.3, Page 477
Shaykh ‘Abdul-Awwal narrates that he heard his father – Shaykh Hammaad ibn Muhammad al-Ansaaree (rahima-hullaah), say:
The ruling of a hadeeth that it is weak should not be passed by anyone except an imaam who has spent his life studying the science of hadeeth; And the people today do not understand this issue, so they declare a hadeeth weak by simply looking at one chain of narration, and this is wrong. And Allaah [alone] has the Complete knowledge [of all affairs].