Devibhagavatapurana 4.17.54

4.17.54

bhīṣmeṇāpi kṛtaṃ kiṃ vā devarūpeṇa bhūtale |
golakau tau samutpādya yattu vaṃśasya rakṣaṇam ||

And what did Bhîsma do living like a Deva in this world? May I ask, was his act of producing two sons by a widow and thus preserving his line of ancestors worthy of his name?