Shiva Purana
तत्र हंसाकृतिर्ब्रह्मा विश्वतः पक्षसंयुतः ॥ मनोनिलजवो भूत्वा गतस्तूर्ध्वं प्रयत्नतः ॥ ३७ ॥
Brahmā took the form of a swan with wings all round and went up assiduously with the speed of the mind or wind.
english translation
tatra haMsAkRtirbrahmA vizvataH pakSasaMyutaH ॥ manonilajavo bhUtvA gatastUrdhvaM prayatnataH ॥ 37 ॥
hk transliteration by Sanscript