I'll do you one better and slay these niggas faithfully

from Jay Z – Dead Presidents II Lyrics on Rap Genius

Meaning

Jay won’t say a prayer for his dead friend — instead, he will avenge him

Jay has no use for prayer: his life is about power and violence, so “faithfully” is partially ironic

Another disavowal of the value of prayer can be seen in “D'Evils”

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