The Home Buyer’s Plan (HBP) is a government program that allows home buyers to withdraw up to $25,000 from their Registered Retirement Saving’s Plan (RRSP) to put towards buying or building a new home.
Before you can withdraw funds, you have to be entered into a written agreement that specifies whether you will be buying or building your new home.  You also must occupy this space no later than a year after buying or building this new home.
Unlike regular RRSP withdrawals, HBP withdrawals are not added to a person's income when withdrawn. Instead, the HBP withdrawals must be repaid over a 15-year period or included in the individual's income if not repaid. Before you can withdraw funds, you have to be entered into a written agreement that specifies whether you will be buying or building your new home.  You also must occupy this space no later than a year after buying or building this new home.

The HBP maximum withdrawal amount—currently $25,000—has not been adjusted for 10 years. To provide first-time home buyers with greater access to their RRSP savings to purchase or build a home, Budget 2019 proposes to increase the Home Buyers' Plan withdrawal limit to $35,000. This would be available for withdrawals made after March 19, 2019.

To take advantage of this program you have to be considered a first-time buyer. You are not a first-time home buyer if you (or you and your spouse) has owned a home which you have occupied as your principal place of residence in the past 5 years.

Once those conditions are met each person can withdraw up to $25,000 tax-free from their RRSP for a new home. Couples, including common-law, can withdraw up to $50,000. You will not pay income tax on these amounts as long as these funds will be repaid into an RRSP in the future.
Existing homeowners can also use this program to purchase an accessible home or a home for a disabled dependent relative. The intended individual must qualify for the disability tax credit (DTC) and this home must be more accessible or better suited to the care of this individual. 

For more information:
https://www.canada.ca/en/revenue-agency/services/tax/individuals/topics/rrsps-related-plans/what-home-buyers-plan/participate-home-buyers-plan.html