Placing one's self in life-threatening danger is a capital crime: Berachot 10b, Pesachim 111a
If one places one's self in danger, his blood is on his own head: Pesachim 111a, 112a (2x)
prohibition against keeping a potentially dangerous item in one's house: Ketuvot 19a-b
Being in danger causes one's sins to be brought up for judgment: Rosh HaShanah 16b
Relying upon a miracle: Megillah 7b; Kiddushin 29b, 39b
One may not extrapolate law for an ordinary case from the law in a case where danger is involved: Eruvin 91a
One should not stay to watch Tefillin which are left in a public area on Shabbat, if that could cause danger for him: Eruvin 95a-b
Specific Physical Dangers
Taking the post-blood-letting meal lightly: Shabbat 129a
Getting on the wrong side of a young Snake, Student, or Nochri: Pesachim 113a
Slicing meat on the back of one's hand: Berachot 8b
Sitting on the bed of a non-Jewish woman: Berachot 8b
Sleeping in a house alone, and danger from a Lilith: Shabbat 151b
Leaving/Entering a Town at night: Pesachim 2a, 8b
Talking while eating is a choking hazard: Taanit 5b
Travelling alone at night: Pesachim 112b
Entering a new bath-house; it may collapse: Pesachim 112b
Standing in front of an ox as it returns from a meadow: Pesachim 112b
Standing near any ox, Dangerous or Not ox: Pesachim 112b
Walking barefoot in a house in which cats may have left small bones about: Pesachim 112b
Not entering a house in the dark, if there are no cats about [to kill snakes]: Pesachim 112b
Living in a town in which there are no barking dogs or neighing horses: Pesachim 113a
Eating a damaging food: Shabbat 113b
Leaving a liquid which was left exposed overnight, around the house: Shabbat 128b
Leaving bubbling, fresh wine out overnight: Taanit 30a
Drinking water which was left out overnight, after passing it through a seive: Succah 50a
Passing over Water: Yoma 77b
Stamping one's foot during a eulogy, in sandals which can twist around: Moed Katan 27b
Wearing Phylacteries with rounded boxes, instead of the usual squared-off boxes: Megillah 24b
Keeping an unchecked Torah Scroll over 30 days: Ketuvot 19b
Gd Guards Fools
Blood-letting on Fridays: Shabbat 129b
Divine Protection for Someone Practicing a Mitzvah
Entering a ruin for a Mitzvah: Berachot 3a
The Mitzvah protects one acting to keep a Mitzvah: Pesachim 8a-b; Kiddushin 39b
Protection when returning from a Mitzvah: Pesachim 8b; Kiddushin 39b
Protection is extended to one who is acting for a Mitzvah as well as for one's own purposes: Pesachim 8a-b
Protection, where the danger is expected, not doubtful: Pesachim 8b; Kiddushin 39b