SB 6.18.9

tat-karma-guṇa-vīryāṇi
 kāśyapasya mahātmanaḥ
paścād vakṣyāmahe ’dityāṁ
 yathaivāvatatāra ha
Synonyms: 
tat — His; karma — activities; guṇa — qualities; vīryāṇi — and power; kāśyapasya — of the son of Kaśyapa; mahā-ātmanaḥ — the great soul; paścāt — later; vakṣyāmahe — I shall describe; adityām — in Aditi; yathā — how; eva — certainly; avatatāra — descended; ha — indeed.
Translation: 
Later [in the Eighth Canto of Śrīmad-Bhāgavatam] I shall describe how Urukrama, Lord Vāmanadeva, appeared as the son of the great sage Kaśyapa and how He covered the three worlds with three steps. I shall describe the uncommon activities He performed, His qualities, His power and how He took birth from the womb of Aditi.