The Lok Sabha was adjourned for the day on Monday to mourn the death of sitting BJP member Hukum Singh who represented the Kairana parliamentary seat in Uttar Pradesh.
Singh (79) breathed his last at a Noida hospital on Saturday.
Before adjourning the proceedings for the day, three newly elected members - two of the Congress and one of theTrinamool Congress took oath and signed the Lok Sabha register.
Congress leaders Karan Singh Yadav and Raghu Sharma were elected from Alwar and Ajmer Lok Sabha seats last week.
Sajda Ahmed of the Trinamool Congress won from the Uluberia parliamentary seat in West Bengal.
After the members took oath, Speaker Sumitra Mahajan made an obituary reference about Hukum Singh, who was also the chairperson of the Standing Committee on Water Resources and member of General Purposes Committee of the Lok Sabha.
"A literary person with deep passion for reading scriptures; poetry and classics, the spirit of which he imbibed in his disciplined life and also reflected in his insightful articles," Sumitra said.
Before coming to Parliament, a delegation of Congress leaders, including Rajasthan unit chief Sachin Pilot, AICC general secretaries Mohan Prakash, C P Joshi and Avinash Pande met Congress president Rahul Gandhi along with the party's victorious candidates.
Besides Sharma and Yadav, Vivek Dhakad won the Assembly bypoll to the Mandalgarh seat in Rajasthan last week.
The elections to Alwar, Ajmer and Uluberia were necessitated due to the death of sitting members Mahant Chand Nath, Sanwarlal Jat and Sultan Ahmed, respectively.