Kevin Garnett and Ray Allen's long-standing rift has been mended on the day the Boston Celtics raised the All-Star center's number five jersey to the rafters in tribute.

The Celtics celebrated Garnett's career after Sunday's 95-92 loss to the Dallas Mavericks, with the 2004 NBA MVP's jersey officially retired by the franchise.

Allen was among those in attendance, which was significant given the rift that emerged between the pair when he opted to move to the Miami Heat as a free agent in 2012.

"It's good to see Ray Allen here," Garnett said during the ceremony. "Real s***. It's good to see you, man. You next, dog."

The Celtics had won the 2008 NBA title with the pair alongside Paul Pierce, while they were Eastern Conference champions in 2010 during a dominant five-year period before Allen's exit prompted the side to drop off.

"Just because I moved away doesn't mean that relationship, that friendship, ends," Allen said.

"It did center around Kevin and myself because I did get the sense that the people here felt how Kevin felt. Once he accepted me, then the people accepted me. That was the sense.

"I was glad we could do that and people could see, 'We won with this guy in 2008, and that's what matters most'."

Former Celtics head coach Doc Rivers, now with the Philadelphia 76ers, weighed in on the reunion.

"Yeah, that's a big one because that's been a problem, obviously, and the fact that it looks like the fence is finally coming down is really cool," Rivers said. "I'm very, very happy for Kevin, and really cool that Ray came today."

Garnett, who won the 2004 NBA MVP with the Minnesota Timberwolves, finished his 22-year NBA career averaging 17.8 points, 10.0 rebounds and 3.7 assists per game.

The power forward/center was a 15-time NBA All-Star, one-time NBA champion and one-time NBA Defensive Player of the Year (both 2008).

Stephen Curry savoured his "special" outing after the Golden State Warriors superstar made history as the NBA's all-time leader for three-pointers.

Curry broke Ray Allen's three-point record with his 2,974th successful shot from beyond the arc in Tuesday's 105-96 victory over the New York Knicks.

A three-time NBA champion and two-time MVP, Curry needed a pair of three-pointers to surpass Hall of Famer Allen at Madison Square Garden, where he finished with five threes.

Curry was congratulated by Allen on the sidelines amid the celebrations after the Warriors guard achieved the feat in the opening quarter in New York.

"It's kind of crazy to think, growing up around the league, watching my dad play, my family going to old Hornets games and having big dreams about shooting the basketball hopefully playing on this level," Curry said after finishing with 22 points.

"To do it here at Madison Square Garden in front of this guy right here [Ray Allen] and Reggie and just all that basketball means to me, it's special.

"Had great support here, in this arena. I can't express how much of an honour that was to have that reaction here on the road and the appreciation for this milestone. And obviously it's great to get the win on top of that. A very, very, very special night."

Curry set the record in his 789th NBA game, 511 appearances fewer than Allen.

"I've been thinking about this number for a long time. I've even got it on my shoes," Curry said on TNT.

"Basketball history. This is pretty special. These two, legends. I watched them growing up and understood what it meant to shoot the ball because of them and my dad.

"Full-circle moment, man. I'm blessed. Blessed, for sure.''

Warriors head coach Steve Kerr added: "I thought the night was perfect. It just pretty much encapsulated who he is and his reaction to it was perfect."

"Steph is the best to ever shoot a basketball and we get the opportunity to go to work with him every day and it's a very special thing," said Warriors team-mate Draymond Green.

NBA commissioner Adam Silver also congratulated Curry in a statement which read: "It was thrilling to see Steph break the NBA's all-time record for three-pointers.

"He has revolutionised the way the game is played and continues to leave fans in awe with his amazing artistry and extraordinary shooting ability. We congratulate him on this historic achievement."