[[Nordboere|Nordboerne]] brugte skikken med blodsbrødre hvis man havde en fosterbror. I ritualet skulle blodet flyde mens man gik under en bue af græstørv sat på et [[spyd]]. Et eksempel er beskrevet i ''[[Gísla saga]]''.<ref>{{citation|last=Poole |first=Russell |author-link=Russell Poole |title=Claiming Kin Skaldic-Style |work=Verbal Encounters: Anglo-Saxon and Old Norse Studies for Roberta Frank |publisher=University of Toronto Press |year=2005 |url=https://books.google.com/books?id=F8naeLlWGikC&pg=PA278 |page=278 |isbn=9780802080110}}</ref><ref>{{cite book|ref={{SfnRef|Dasent|1866}}|translator=George Webbe Dasent|translator-link=George Webbe Dasent |others=Mildmay, C. E. St. John (illustrator) |title=The Story of Gisli the Outlaw |place=Edinburgh |publisher=Edmonston and Douglas |year=1866 |url=https://archive.org/details/storygislioutla00dasegoog |pages=[https://archive.org/details/storygislioutla00dasegoog/page/n77 23]–24}}</ref> I ''[[Fóstbrœðra saga]]'' bliver båndet mellem Thorgeir Havarsson (Þorgeir Hávarsson) og Thormod Bersason (Þormóð Bersason) også forseglet med et lignende retualr kaldet ''leikr''.<ref>{{citation|last=Gunnell |first=Terry |author-link=<!--Terry Gunnell--> |title=The Origins of Drama in Scandinavia |publisher=Boydell & Brewer Ltd |year=1995 |url=https://books.google.com/books?id=c8Elw62Qaf0C&pg=PA27 |page=27 |isbn=9780859914581}}</ref>
Mellemmenneskelige_forhold