From Harry Potter and the Order of the Phoenix

'Manners, Potter, or I'll have to give you a detention,' drawled Malfoy, whose sleek blond hair and pointed chin were just like his father's. 'You see, I, unlike you, have been made a prefect, which means that I, unlike you, have the power to hand out punishments.'
'Yeah,' said Harry, 'but you, unlike me, are a git, so get out and leave us alone.' (OP10)

'Tell me, how does it feel being second-best to Weasley, Potter?' he [Malfoy] asked.
'Shut up, Malfoy,' said Hermione sharply.
'I seem to have touched a nerve,' said Malfoy, smirking. 'Well, just watch yourself, Potter, because I'll be dogging your footsteps in case you step out of line.' (OP10)

Hermione: 'Malfoy was being absolutely foul to a first-year back there. I swear I'm going to report him, he's only had his badge three minutes and he's using it to bully people worse than ever… (OP10)

'Maybe,' said Malfoy in an undertone, so that only Harry could hear him, 'the stupid great oaf's got himself badly injured.'

From Harry Potter and the Goblet of Fire

'Granger, they're after Muggles,' said Malfoy. 'D' you want to be showing off your knickers in midair? Because if you do, hang around ... they're moving this way, and it would give us all a laugh.' (GF9)

'Hermione's a witch!' Harry snarled.
'Have it your own way, Potter,' said Malfoy, grinning maliciously. 'If you think they can't spot a Mudblood, stay where you are.' (GF9)

Malfoy chuckled softly. 'Scare easily, don't they?' he said lazily. 'I suppose your daddy told you all to hide? What's he up to – trying to rescue the Muggles?' (GF9)

'Where're your parents?' said Harry, his temper rising. 'Out there wearing masks, are they?'
Malfoy turned his face to Harry, still smiling. 'Well… if they were, I wouldn't be likely to tell you, would I, Potter?' (GF9)

'Keep that big bushy head down, Granger,' sneered Malfoy. (GF9)

Overheard on the train: '...Father actually considered sending me to Durmstrang rather than Hogwarts, you know. He knows the headmaster, you see. Well, you know his opinion of Dumbledore – the man's such a Mud-blood-lover – and...

From Harry Potter and the Prisoner of Azkaban

'Well, look who it is,' said Malfoy in his usual, lazy drawl, pulling open the compartment door. 'Potty and the Weasel.' (PA5)

'I heard your rather finally got his hands on some gold this summer, Weasley,' said Malfoy. 'Did your mother die of shock?' (PA5)

'You fainted, Potter? Is Longbottom telling the truth? You actually fainted!' (PA5)

'Did you faint as well, Weasley?' said Malfoy loudly. 'Did the scary old Dementors frighten you, too, Weasley?' (PA5)

George looked up in time to see Malfoy pretending to faint with terror again. 'That little git,' he said calmly. 'He wasn't so cocky last night when the Dementors were down our end of the train. Came running into our compartment, didn't he, Fred?'
'Nearly wet himself,' said Fred, with a contemptuous glance at Malfoy. (PA6)

'Oh, how silly we've all been!' Malfoy sneered. 'We should have stroked them! Why didn't we guess!'