Paraskaragrihyasutra 1.8.1

1.8.1

athaināmudīcīṃ saptapadāni prakrāmayati ekamiṣe dve ūrje trīṇi rāyaspoṣāya catvāri māyobhavāya pañca paśubhyaḥ ṣaḍ ṛtubhyaḥ sakhe saptapadā bhava sā māmanuvratā bhava \1\

Then he makes her step forward in a northern direction seven steps (with the words),
'One for sap, two for juice, three for the prospering of wealth, four for comfort, five for cattle, six for the seasons. Friend! be with seven steps (united to me). So be thou devoted to me.'