Is a person obligated to summon their adversary to the judge when filing a claim?

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The obligation exists for the claimant to summon the adversary to the judge, regardless of whether a prior dealing between them is known or not, and irrespective of social standing, such as a poor person suing a wealthy and prominent one. This view is held according to one narration, adopted by Abu Bakr, and is the position of the Madhab of Abu Hanifa and Al-Shafi'i. The evidence for this is that failing to summon results in the loss of rights and the allowance of injustice, as the right may stem from wrongful seizure, unpaid debt, or unreturned deposit or loan, even without prior dealings. This harm of losing a right is greater than the harm of appearing before the judge, which carries no disgrace. Historical precedents include Umar and Abi appearing before Zayd, the claimant and another appearing before Shurayh, and Ali appearing before Shurayh, and Al-Mansur appearing before a man who was the son of Talha ibn Ubayd Allah.