Oath of moment

From Lexicanum

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Oath of moment - special oath made by Luna Wolves before every mission. This type of oath was made just for the purpose of specific action or campaign: Space Marine swore that he would complete his mission. This is different oath than standard oaths of loyalty to Emperor and Imperium, and is sometimes treated as a refreshing of those. Oaths of moment were described in different ways in various sources.

Such oath requires to be listened to by two another Marines, usually of the same rank or higher. One comes 'to listen' and second 'to attest'.

Sources

• Horus Rising by Dan Abnett