Mahabharata 1.225.10

यदा प्रसन्नो भगवान्महादेवो भविष्यतितुभ्यं तदा प्रदास्यामि पाण्डवास्त्राणि सर्वशः

yadā prasanno bhagavānmahādevo bhaviṣyatitubhyaṃ tadā pradāsyāmi pāṇḍavāstrāṇi sarvaśaḥ

Our plain-language meaning of this verse is waiting for scholar review.