Job 1:4

His sons used to go and make a feast in the house of each on his day, and they would send and call for their three sisters to eat and drink with them.
Job 1:4, Modern English Version (MEV)
 
His sons used to take turns hosting parties in their homes, always inviting their three sisters to join them in their merrymaking.
Job 1:4, The Message (MSG)
 
Ever helpful, Albert Barne’s Notes on the Whole Bible tells us that:
 
And his sons went and feasted in their houses - Dr. Good renders this, “and his sons went to hold a banquet house.” Tindal renders it, “made bankertea.” The Hebrew means, they went and made a “house-feast;” and the idea is, that they gave an entertainment in their dwellings, in the ordinary way in which such entertainments were made. The word used here (משׁתה mı̂shteh) is derived from שׁתה shâthâh, “to drink;” and then to drink together, to banquet. Schultens supposes that this was merely designed to keep up the proper familiarity between the different branches of the family, and not for purposes of revelry and dissipation; and this seems to accord with the view of Job. He, though a pious man, was not opposed to it, but he apprehended merely that they might have sinned in their hearts, Job 1:5. He knew the danger, and hence, he was more assiduous in imploring for them the divine guardianship.
 
Every one his day - In his proper turn, or when his day came round. Perhaps it refers only to their birthdays; see Job 3:1, where the word “day” is used to denote a birthday. In early times the birthday was observed with great solemnity and rejoicing. Perhaps in this statement the author of the Book of Job means to intimate that his family lived in entire harmony, and to give a picture of his domestic happiness strongly contrasted with the calamities which came upon his household. It was a great aggravation of his sufferings that a family thus peaceful and harmonious was wholly broken up. - The Chaldee adds, “until seven days were completed,” supposing that each one of these feasts lasted seven days, a supposition by no means improbable, if the families were in any considerable degree remote from each other.
 
And sent and called for their three sisters - This also may be regarded as a circumstance showing that these occasions were not designed for revelry. Young men, when they congregate for dissipation, do not usually invite their “sisters” to be with them; nor do they usually desire the presence of virtuous females at all. The probability, therefore, is, that this was designed as affectionate and friendly family conversation. In itself there was nothing wrong in it, nor was there necessarily any danger; yet Job felt it “possible” that they might have erred and forgotten God, and hence, he was engaged in more intense and ardent devotion on their account; Job 1:5.