The following two narrations highlight a useful principle when examining the jarh of one scholar of another.

Ibn Hajar said,  “It is necessary that we don’t take the Jarh of one who does Jarh on someone who he has enmity with.” [Lisaan al-Meezaan (1/16)]

Adh-Dhahahbee said, “…many a time contemporary scholars talk about each other, however it is necessary that we don’t base Jarh on justice and being fair.” [Mooqithaa (Pg. 84)]