Greetings, charity, and the Hereafter

What grammatical form is shared by «أَفْشُوا»، «أَطْعِمُوا»، «صِلُوا»?

Greetings, Family Ties, Charity, and Preparation for the Hereafter (Accounts 6–8)

• Singular past tense
• Plural imperatives
• Active participles
• Prepositions