शपथातिक्रमे महतां तपस्विनां मुख्यानां वा प्रातिभाव्यबन्धः प्रतिभूः ॥ कZ_०७.१७.०८ ॥
śapathātikrame mahatāṃ tapasvināṃ mukhyānāṃ vā prātibhāvyabandhaḥ pratibhūḥ
In case of violation of an oath, a surety-bond should be taken—namely, a guarantor (pratibhū) who is a great person, an ascetic of standing, or a principal (leading) man.
Their reputational capital and social authority raise the cost of breach; they can exert pressure on the violator and provide a credible enforcement channel beyond mere words.