Luke 11:12

Or, if asked for an egg, will he hand him a scorpion?

Luke 10:19

I have indeed given you the power of treading on serpents and scorpions and of trampling down all the power of the Enemy; nothing shall injure you.

Revelation 9:10

their tails and their stings were like scorpions', and their power of hurting men for five months lay in their tails;

Treasury of Scripture Knowledge

Summary

Or if he shall ask an egg, will he offer him a scorpion?

General references

Bible References

A scorpion

Luke 10:19
I have indeed given you the power of treading on serpents and scorpions and of trampling down all the power of the Enemy; nothing shall injure you.
Revelation 9:10
their tails and their stings were like scorpions', and their power of hurting men for five months lay in their tails;

General references

Matthew 7:9
Why, which of you, when asked by his son for a loaf, will hand him a stone?