Derived from the root ‘hve’ (‘to call’) āhāva is the technical name of a formula of summons pronounced loudly by the hotṛ (chief of the priests representing the Ṛgveda) in a Soma sacrifice before starting the śastra (laudatory recitation). It is usually in the form of: śoṁ 3 1 sāvom or śoṁsāvo 3 (a corrupt form of śaṁsāva).
Soma juice is extracted (savana) three times during the day: morning (prāta-ssavana), noon (mādhyandinasavana) and later in the day (tṛtīyasavana). During all these three savanas āhāva is done 4 times in the first, 5 times in the second and again 4 times in the third.
The formula of reply by the adhvaryu (chief of the priests representing the Yajurveda) is called pratigara.