yathoktaṃ bhāṣye śābare "na ca svargakāmo yajetetyato vacanāt saṃdigdhamavagamyante bhavati vā sargo na vā bhavatīti"
As stated in Śabara's Bhāṣya: "And from the statement 'one who desires heaven should sacrifice,' nothing doubtful is understood [in the form] 'heaven may or may not occur.'"